Palermo. Deputy Commissioner Giulia Corsi has an appointment with Alfio Spada, a member of the Serao clan who is showing signs of repentance. During the meeting, Spada begins to reveal something hot but two hitmen burst in and open fire. Giulia, wounded, is unable to save her informant. Meanwhile, in Rome, many colleagues have left the X Tuscolano. Understaffed, our men wonder why replacements haven't arrived yet. Luca Benvenuto, in a meeting with Commissioner Fittante, discovers that, due to lack of funds, the X will be closed. But fate plays a cruel trick. A shooting in a bar in Tuscolano leaves three dead and one wounded, Remo Damiani (Marco Giuliani). We discover that Remo and Luca were inseparable as teenagers. Pranks, pranks, and a shared love for Viola (Antonella Bavaro), the woman who is now married to Remo and is the mother of their only son, Marco.

Luca meets Viola and informs her of the tragedy that occurred, showing himself to be very close to his dear childhood friend. While the search for the bodies at the site of the explosion continues, Luca must still solve a complex case. Journalist Cosimo Notari has fallen victim to a clear mafia execution. In a video message, Notari himself accuses the builder Francesco Lomartire of his own death, whom he had been investigating for some time for alleged mafia infiltration. But there is no evidence to frame Lomartire. Barbara Rostagno (Lucilla Agosti) discovers that the killer who carried out the murder mounted a particular part on the motorbike, and in this way traces his identity, without telling his colleagues. But the hitman, Evaristo Rossi, surprises her and knocks her out. Our men manage to save her just in time.

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A trap for the men of the X, who find themselves in the middle of a sea of ​​bullets. Giulia Corsi forced to deal with the death of Luisa Baccarini, her only possible witness. The case of a missing child and a man, Remo Damiani, who reappears before Viola's eyes, forcing her to make a heartbreaking choice.

Convinced that Luisa Baccarini was murdered, our men investigate the few traces of DNA found at the crime scene. The lead turns out to be good. Thus begins the hunt for Oscar Romero. But Viola also wants to get in touch with Remo, who she has discovered is alive. Meanwhile, X is busy solving the case of an elderly retired teacher found murdered in a park.

Investigating the murder of a famous TV presenter, our heroes come into contact for the first time with a world of appearances and unbridled ambitions, which push even ordinary people to exploit their feelings to indulge their desire for money and success. Meanwhile, Remo's gang continues to evade capture... and Giulia and Luca come into conflict over this.

Who put that bouquet of flowers on Paolo Libero's grave? Giulia is determined to find out. But Luca also has his own ghost to chase, because the clues that lead him to think that Remo is still alive are starting to become too many. Meanwhile, the search for a missing eighteen-year-old tells us once again that the world of teenagers can hide many secrets.

The discovery of a man's body uncovers an intricate and ferocious family story in which it will be difficult for our heroes to figure out who the real culprit of the murder is. In the meantime, the investigations into Remo Damiani's gang continue apace. And in one long night, the fates of the men of the X, their loved ones, and their sworn enemies will be decided.

Giulia Corsi hostage of Oscar Romero. These are dramatic hours for her, for her and for Barbara Rostagno who finds herself hunting the man who killed her sister... Meanwhile, the case of a broken family, the Ricciardis, torn apart by the sudden return of a 'ghost', erupts at X like a tsunami.

The man who killed Paolo Libero doesn't have a name yet, but Giulia Corsi has never been so close to him. Just like Luca, who has never been so close to Remo and meets him again in a tragic and violent circumstance. Meanwhile, the case of a dead researcher will shed light on new scams and old gossip in the academic world.

Viola's conditions, after the attack, seem stable and Luca can breathe a sigh of relief, but when he goes to visit her, she reveals to him that she has been playing a double game with Remo, right from the start. Meanwhile, Giulia is on the trail of a mysterious lawyer. Could he be the puppeteer behind this whole story?

Giulia decides that the time has come to lure Remo into a trap using Viola as bait, but Luca does not agree. Meanwhile, the research on the mysterious lawyer finally bears fruit.

Thanks to Luca's help, Viola manages to obtain house arrest. A painful meeting between the two will clarify the woman's true feelings. Giulia, meanwhile, continues to investigate Balsamo, against all odds.

Giulia is forced by an unforeseen event to leave for Palermo, but the investigations on Balsamo and his role, the link between mafia and politics, resume. And while Corsi investigates in the Sicilian capital, in Rome a serious threat looms over an honest and incorruptible councilor.

Luca and his colleagues from the X Tuscolano await Giulia's return from Palermo. But they are not the only ones: on the orders of the lawyer Balsamo, Remo and Diego are ready to blow her up with a car bomb. What Remo does not know is that the lawyer has decided that he too must die in the attack.

After the order to abandon the investigation on Balsamo, Giulia decides to continue investigating on her own. She begins to secretly monitor the lawyer's villa, who, however, is already preparing his countermove.

The meeting between Giulia and Balsamo has dramatic and unpredictable results. What if Corsi's obsession with the lawyer had led her to truly lose her mind? In the meantime, Barbara finds herself entangled in a case that brings her entire past into play.

Giulia is in prison, but Luca continues to deal with the investigation, perhaps he has found a small crack in the accusatory system. In the meantime, Barbara is kidnapped by the mysterious serial killer. Pietro and Gabriele manage to save her, but a sensational twist completely overturns the direction of the investigation.

After the discovery of Andrea Greco's body, suspicions about who the serial killer might be focus on Roberto, Barbara's ex-husband. Rostagno is initially incredulous, but little by little she realizes that the hypothesis is far from unfounded.

Luca is convinced that Remo's testimony can finally exonerate Giulia, but it is still too early to claim victory. Viola is still in Balsamo's hands and Remo is willing to risk his life to save her.

The day of reckoning has come for Remo, Luca, Diego and Ettore. The stakes are high and twofold: on one side, the life of Viola Damiani; on the other, the freedom of Giulia Corsi. But in the meantime, there is no time to waste, the Tenth must solve the case of Simonetta Cerci, a young mother murdered in a barbaric way.

A new pain for Luca Benvenuto. Enzo Tiberi, the man who many years before, thanks to boxing, saved him from taking the bad path of crime, has been killed, stabbed. Luca does everything he can to solve the case. But he must also deal with the testimony of Ettore, Balsamo's Mephistophelian right-hand man, and the definitive release of Giulia Corsi.

Balsamo has escaped. But where? The police all over Italy are alerted. The justice system is about to tighten around the shady lawyer, the instigator of Paolo Libero's death. But the daily life of the Tenth is also calling: the case of what appears to be a double, mysterious murder must be solved.

Denise, a femme fatale desired by all. And that all the men she frequented, jealous of her, could have killed. And in the meantime, the frantic race to find Balsamo before he escapes again, and this time it is no longer possible to understand where. Keeping everything under control, for Luca and Giulia, is increasingly difficult, especially if the boss Carmine Serao also enters the scene.

After the death of Remo, brutally murdered by the Serao, Luca promises little Marco to avenge his father's death. But to do this he needs the lawyer Balsamoche who proposes to the police a pact that is hard to accept, especially for Giulia. In the meantime, the ordinary investigations focus on the mysterious disappearance of a screenwriter.