Mehmed, having overcome many obstacles, prepares for the siege of Constantinople, uniting his viziers and subjects. He strengthens the navy, led by Baltaoğlu, who aims to reunite with his brother, Rizzo. Çandarlı makes Rizzo grateful to the Ottomans, and Mehmed sets his plan on Rizzo, whose help is crucial. In the Harem, preparations for the siege continue, with Mara, Bahar, and Gülşah actively involved. Gülşah's pregnancy adds excitement, with the upcoming birth expected to change the harem's dynamics. In Byzantium, the fear of the Ottomans grows, and Constantine, struggling to make decisions, is advised by Plethon to call Notaras back. This decision's impact on the Byzantines remains to be seen.

Following Sultan Murad's unexpected death, the Ottoman palace mourns and a new era begins. The question arises: will Mehmed or Orhan ascend to the throne? Despite İshak's opposition, Çandarlı supports Mehmed's succession, fearing unfortunate consequences. Mehmed, cautious of potential plots, sets out carefully with his servants. Constantine plans to hinder Mehmed, favoring Orhan's ascension. Orhan, closer to Edirne and with a better chance at the throne, rejects Konstantinos' offer for help, knowing it would not be welcomed. He faces an unexpected obstacle, Bali Bey, whose intentions remain unclear.

After conquering Dimitria Castle and defeating the Hurufi plague, Mehmed sets his sights on Constantinople. He tasks Evrenosoğlu with eliminating Orhan, aiming to trap him with a plan involving Hala Sultan. Meanwhile, Konstantinos, seeking to recover from his defeat, sends Sfrancis to attack the dervishes, hoping to prove the Turks cannot establish themselves. This draws the Ottomans towards him, and Çandarlı marches to confront Sfrancis. In the harem, Halime plans to kidnap Hala Sultan, who is awaiting her fate. The outcome of this plot remains uncertain.

After Prince Ahmed's death and Kurtçu Doğan's execution of Mehmed, Mehmed declares a new era, removing Kurtçu Doğan from Ocak Ağa and punishing the rebels. He reaffirms his goal of conquering Constantinople. Constantine, having exiled Notaras and brought in Sfrancis, tests Mehmed's stance on peace by sending an ambassador again. Meanwhile, Helena plans to marry off Constantine, seeking a suitable wife. In the harem, Halime's time ends as she passes away following Ahmed's death. Gülşah intercepts a letter sent to Mihriban, adding intrigue regarding Hala Sultan's involvement.

Constantine reveals the truth to Mehmed when handing over Mara, exposing Çandarlı Halil's collaboration. Mara must decide whether to inform Mehmed or confront Çandarlı herself. Tired of political games, Mehmed sets his sights on conquering Dimitria Castle. Mara's return causes concern for Hala Sultan, prompting her to warn Mihriban. Mara devises a dangerous plan to expose Hala Sultan. The outcome of this scheme remains uncertain. Constantine seeks to bolster his city's security and considers seeking help from the Vatican, despite opposition from Helena and Sfrancis. The success of this unity and Constantine's plans hinge on overcoming these internal disagreements.

The Ottoman army, led by Zaganos, faced resistance at Dimitria Castle. When hope seemed lost, Sultan Mehmed arrived, inspired his soldiers, and ordered a final attack, aiming for victory. Meanwhile, the Hurufis, taking over provisions and spreading propaganda in the capital, face a new challenge as Mehmed is determined to protect his state from corrupt beliefs. Mara, seeking to undermine Byzantium through Hala Sultan, gains Mehmed's permission for her plan. Konstantinos, upon learning from his mother Helena why the castle was lost, plans to issue a harsh punishment to set an example.

While campaigning against Karaman, Mehmed invites Evrenesoğlu Ali to handle potential issues in the capital, appointing him as the palace trustee. Çandarlı, remaining in the capital, plots to place Ahmed on the throne by manipulating Gülşah, facing obstacles from Halime who also aims to make Ahmed sultan. Konstantinos makes a risky offer to increase Orhan's allocation to quell discontent about Orhan's expenses, awaiting Mehmed's response. Kurtçu, following Çandarlı's orders, plans to intercept Mehmed and challenge him to pass under swords, risking conflict with the Janissaries. The unfolding events create a tense atmosphere, with Mehmed's decisions and responses critically shaping the outcomes.

On the night of his wedding, Mehmed embarks on a risky journey to Constantinople to save Zağanos, collaborating with an unexpected ally from the Byzantine palace. He also meets Urban, hoping to convince him to return. Mehmed's plans are shattered by news of his mother's death, causing him to question his father. His departure to Constantinople causes chaos in Edirne Palace, prompting İbrahim to confront Murad about Gülşah. Meanwhile, Helena and Notaras, aware of Turkish infiltrators, plan to capture Mehmed, which causes tension between Konstantinos and his mother Helena. The success of their plans and Mehmed's fate hang in the balance.

Prince Mehmed, ambushed by the poor, fights fiercely as İshak approaches with his men. Mehmed later returns to Edirne and moves his harem to Manisa, where he receives a letter to Gülşah prompting a journey to Karamanoğlu. Murad deteriorates after Hüma's death, causing concern for Çandarlı, who contemplates measures for the state's future. Mehmed, aware of the situation, leaves Şehabeddin in Edirne. In Byzantium, tensions between Konstantinos and Helena intensify as Konstantinos prepares to make significant changes, with Helena and Notaras posing major obstacles.

After ascending to the throne, Mehmed confronts Halime for attempting to kidnap Ahmed and Çandarlı for his alleged complicity. Halime faces a choice: implicate Çandarlı or remain silent. Mehmed establishes a new order in the palace and must decide on the Grand Vizier. In the harem, Bahar becomes the chief haseki, marking a new era. Hala Sultan's unexpected arrival disrupts the harem's order, and her first move targets Halime. Gülşah is placed under Bahar's influence by Mehmed. Çandarlı plans a new strategy against Mehmed, using Piri Pasha's arrival to pit the Ottomans against Karaman. The unfolding events set the stage for further political intrigue and power struggles.

A cannon explodes near Mehmed, turning the area into chaos. Quickly removed, Mehmed faces more disappointments, including a fortress raid and Mara's kidnapping, pushing him to demand accountability from the betrayer and the careless. Konstantinos, having kidnapped Mara, tries to convince her to marry him, but Mara stands firm. The outcome of this struggle remains uncertain. Orhan seeks revenge on Bali, whose fate is in question. Hala Sultan, having created space by removing Mara from the harem, has new goals. It is uncertain whether Bahar and Gülşah will counter her moves or if Hala Sultan will dominate the harem.

Mehmed narrowly escapes an ambush by Janosh and faces the challenge of assisting his father, Murad, who is under attack from Wallachians with explosive pots. Murad must also defend himself against a sneaky Wallachian. Upon returning from the victorious Kosovo War, Çandarlı seeks revenge on Mehmed by setting up a scheme during Zafer Toyunda. Mehmed and Gülşah's marriage occurs with Sultan Murad's and İbrahim Han's permission, despite Mehmed's reluctance, causing concern for Bahar. In the harem, Halime Sultan manipulates Murad to send Hüma to Bursa, worsening Hüma's illness. Halime continues plotting, now focusing on Gülşah as Mehmed's wife.

Prince Alaaddin's unexpected death prompts Murad Khan to retreat to Bursa, succeeded by his son Mehmed. Despite being perceived as immature by European states, Mehmed proves otherwise when faced with Orhan, backed by Byzantium, in his first major battle for the throne. Mehmed's dream is to conquer Constantinople, despite doubts from those around him, including Çandarlı. Mehmed's determination leads to clashes with rebels, orchestrated by Çandarlı, resulting in his exile. However, Mehmed remains resolute, destined to return as sultan one day.

Mehmed proved his innocence to Sultan Murad by capturing Capello. Murad then questioned Mehmed about the silver coins printed in his name, which Mehmed explained. With the Crusaders advancing, Mehmed proposed an Oghuz Union, which Çandarlı opposed. The council awaited Murad's decision. Following Murad's orders, Mehmed found Wallachians escaping from Janosh and planned an attack with their help. Janosh, however, also strategized against the Ottomans, leading to uncertainty about the outcome. Prince Ahmed choked on roasted chickpeas, witnessed only by Hüma and her apprentice Çeşmidil. Hüma faced a dilemma of whether to intervene or not, creating potential tension in the palace, especially with Halime. In Byzantium, Demetrios escaped a trap and became emperor, surprising Helena, Konstantinos, and Notaras. Demetrios's judgment on the attempt and the responses of the others remain to be seen.

Mehmed, having executed the Byzantine ambassador, announces his goal and demands immediate preparations, instructing Urban to expedite his work. He sends Zağanos Pasha to implement a justice revolution and prepare for conquest, but Zağanos returns unsuccessful. Determined, Mehmed plans to personally convince Hızır Çelebi. Gülşah suspects Mihriban of betrayal and informs Hala Sultan. Hala Sultan must convince Gülşah, while Mara, mistrusting Hala Sultan, pursues her, leading to a confrontation. Konstantinos seeks to halt the fortress construction, with Sfrancis suggesting a raid involving Orhan. The Balinese working on the fortress face potential attacks, raising questions about their ability to resist.

Mehmed, having left the throne to his father Murad, returns to Saruhan to address local issues, including pirates obstructing trade. Solving this would fulfill the people's wishes and address a personal problem for Mehmed. The Venetians complain about Mehmed to Murad, and Çandarlı presents evidence against him, prompting Sultan Murad to summon Mehmed to account for his actions. Mehmed must either face the Sultan with Bali Beys or capture the pirate leader, Capello, to clear his name. In the harem, Mehmed's summons worries Hüma but pleases Halime. Mara plots to eliminate rivals for Mehmed by ensuring Ahmed's disappearance. The reactions of Hüma and any counter plans from Halime add to the intrigue.

After Admiral Rizzo's betrayal and Hayrettin's death, Mehmed plans revenge, forcing Rizzo to seek refuge in the Pontus Greek Empire, which must choose between surrendering Rizzo or facing Ottoman wrath. Rizzo is also targeted by Çandarlı for causing his nephew's death. In Byzantium, Emperor Constantine invites Notaras, who begins forming alliances with the Kingdom of Serbia and Karaman Principality, aiming to corner the Ottomans. The success of these alliances and their impact on the Ottoman siege plans remain uncertain. In the Harem, the alliance attempts affect Mara Hatun and Gülşah Hatun, creating tension and a test of loyalty towards Mehmed, possibly leading to a rift.

After thwarting Byzantium's plans and responding to Notaras, Mehmed continued his conquest preparations, warning his pashas to stay vigilant, especially Baltaoğlu. However, Baltaoğlu fell victim to Konstantinos' plot. Çandarlı, seeking revenge for his nephew Hayreddin, focused on finding Rizzo. Konstantinos, seeing the failure of alliances with the Serbs and Karamanoğlu, sought the Pope's support but was rejected, except by Giovanni Giustianni, who nonetheless set off for Constantinople.

Mehmed holds Baltaoğlu Süleyman Pasha accountable for Guistinianni's entry into the city, facing a potential execution. Çandarlı may try to persuade Mehmed to change his mind. In the harem, Prince Beyazıd's discomfort might continue due to the attention given to Mustafa. Meanwhile, the Balinese pursuing Demetrios in Mora face various challenges and obstacles, with Demetrios and his wife Theodore plotting their own strategies. In Constantinople, the arrival of Guistinianni's soldiers will impact the city's atmosphere. Both Ottoman and Byzantine sides prepare for tactical battles before the siege, with Mehmed planning his moves towards the city's walls and gates. The responses of Zağanos, İshak Pasha, and other Kubbealtı ministers to Mehmed's strategies, as well as the defensive plans of Konstantinos, Notaras, and Giustinianni, will shape the upcoming conflict.

Mehmed questions Gülşah and Bahar, blamed for Prince Beyazıd's condition, about their responsibilities. The harem's roles might change, with Mara Hatun managing potential conflicts. Demetrios, grieving his child's loss, considers avoiding the Byzantine-Ottoman conflict, while Theodore, devastated, urges him to leave for Morea. In the Ottoman court, Zağanos Pasha, who acted without Mehmed's approval, faces potential consequences once Mehmed learns the truth. Guistiniani, arriving in Constantinople, aims to defend the Golden Horn against the Turks, while the Emperor strategizes amidst internal disagreements. Guistiniani also targets Turkish spies in the city. In Galata, tensions rise as Notaras deals with Lomellino, who sides with the Turks, and Janissaries are sent to protect the Golden Horn chain. Sultan Mehmed calls for an unprecedented consultation with the sanjak beys, including Teke Sanjak Beyi Ismail, whose political stance before the siege remains crucial.

Teke Sanjak Bey Ismail and those responsible for the assassination attempt on Sultan Mehmed with the poisoned robe await the Sultan's verdict. Zağanos, who revealed the plot, might influence Mehmed's judgment. Zağanos Pasha, who acted without the Sultan's approval and caused Demetrios' child's death, faces a potential showdown with Çandarlı Pasha. Meanwhile, Sultan Mehmed must respond to the massacre of Ottoman Janissaries in the Golden Horn, which could significantly motivate the council and army and impact the siege. Guistiniani, planning through Lorenzo, aims to counter the Ottomans, possibly informing Constantine. He seeks to expose spies within Byzantium. Key players like Lomellino, Minotto, and Lorenzo face significant developments amid these showdowns.

As Sultan Mehmed prepares for the great siege, he aims to breach the walls and enter the Golden Horn. He assigns critical responsibilities to his trusted men and plans who will sit on the throne during his absence. He must appoint someone to the Rumelia Beylerbeyship after Hamza is wounded, with Çandarlı Halil Pasha and Zağanos Pasha's input. Saltuk and Bali have important tasks until Hamza returns. In the harem, a surprise occurs during Beyazıd's journey to Manisa. Meanwhile, Constantine works on creating grejuva fire against the Turks, and Giustiniani seeks to expose Turkish spies in Constantinople, including suspicions about Mustafa. Giustiniani holds Notaras responsible for Cardinal Isodor's death, and the Emperor must respond. Demetrios plans against Hamza, and there are surprises in the mission to bring Giustiniani and those with the grejuva secret to the city.

Mehmed embarks on his conquest with a desire for martyrdom. His success depends on his staff agreeing on the strategy and shaping his policies towards his vizier and the Janissaries. Hamza's wounding affects the Malkoçoğlu tribe and the Rumelia Beylerbeylik, with moves expected from Çandarlı and Zağanos Pasha. Guistiniani suspects Mehmed's spy Mustafa and needs to present proof to Emperor Constantine. Nadia seeks validation from Guistiniani despite her romantic entanglement with Anna. Notaras, implicated in Cardinal Isodor's murder, seeks assistance. Demetrios, grieving his child's death, must decide on his political allegiance. The safe arrival of Mehmed's Şahi cannon is crucial, while the Grejuva master must meet Konstantinos' expectations. Internal conflicts among the Janissaries add tension. These events will determine the outcome of Mehmed's conquest.

Urban and Mehmed insist the damaged Şahi cannon be detonated, tasking Saruca with this risky mission. The explosion's aftermath for Mehmed is uncertain. Çandarlı aims to win Mehmed's favor for Kalender and isolate Kurtçu politically. Çandarlı, Zağanos, and İshak Pasha hope to use Plethon's peace call to their advantage, questioning if they realize it's a ploy. Demetrios, grieving his child, seeks Hamza. Alperen, having volunteered without consulting his father, contemplates his actions post-discussion. Konstantinos searches for Cardinal İzodore's killer, awaiting crucial news. With the Turks nearing, Konstantinos plots his next move. Orhan and Mustafa face potential danger. Emotional ties between Guistiniani and Anna develop, while Guistiniani's suspicion of Notaras in Isodore's death is under scrutiny.

Mehmed's response to Plethon's peace offer and his complacent minister will impact the conquest. Zağanos brings news involving Evrenosoğlu, influencing Mehmed's stance. Mehmed's reaction to Grejuva's attack on the Janissaries will shape the general assault and its outcomes for Kurtçu. Çandarlı Pasha delivers crucial news from Constantinople, potentially altering decisions. Alperen, who joined the siege without consulting Evrenosoğlu, faces significant actions. Ferhat, backed by Çandarlı, aims to secure the Rumelia Beylerbeylik seal and win the Sultan's favor. Demetrios' motivation against Mehmed is in question upon his return. Nadia, jealous of Anna and Guistiniani's relationship, plans an attack, potentially impacting Guistiniani's motivation.