The bartender Giuseppe Alfò threatens to commit suicide and Marshal Rocca, who has come, seems to be able to make him give up his intention. The same evening, Alfò is found suffocated in his car: the most accredited hypothesis, that of suicide, does not convince the Marshal, who during the investigation knows not only Alfò's wife, but also Margherita, his new flame .

Father and son, managers of a fish market, are at odds with a mafia family because of the gambling debts incurred by their father. Thanks to the carabinieri, the two initially escape an ambush by criminals, but their son will later be found dead. Marshal Rocca will discover that the boy was actually the son of a wealthy entrepreneur and that the man's grandchildren are responsible for his death, eager to grab the entire inheritance.

Marshal Rocca finds Serafino, a penniless old man who has received an eviction order, a place in the Villa Rosa rest home, in order to prevent his home from burning down as he threatened to do. The first night the old man is hosted in the structure, it catches fire. Serafino is the main suspect, but the marshal is convinced that the track is another.

Rocca investigates the murder of his homeless friend Alberto Molfetta, who was set on fire. During the investigation, a father accuses himself of the crime to cover up for his son, but Rocca, deeming him innocent, discovers the real culprits. Once the case has been resolved, the marshal pays homage to his dead friend by fulfilling his last wish: a concert with Molfetta's voice spread throughout the square.

A friend of Daniela's, Sandra Varano, mysteriously disappears: Daniela had seen her arguing with Giorgio Massenzi, her boyfriend, who is immediately questioned by Marshal Rocca. Even Daniela, however, seems to be hiding something. It then turns out that the girl had turned to a nurse for an illegal abortion and had run away from home to escape her father and the father of the child. Brigadier Cacciapuoti, despite being on leave, can't help but help his marshal.

Carabiniere Michele Falcetti arrives in Viterbo to replace Antonio Fait, killed a month earlier. A new case prevents Marshal Rocca from taking the exam for the passage of grade: Roberto, his youngest son, is taken hostage during a robbery in a supermarket and his colleague Banti is wounded in the shooting against the robbers. The marshal manages to find his son and have all the robbers arrested, but he has to give up the precious collaboration of brigadier Cacciapuoti: the latter, caught by a heart attack during the investigation, goes on leave for health reasons.

The son of marshal Rocca, Giacomo, met a girl in a disco, accompanied by a friend who wore flashy clothes and a showy pair of boots. The same girl is then thrown out of a moving car, after being beaten up, without documents with her. The marshal will first have to dispel the doubt that his son is involved in the affair, and then investigate the clandestine prostitution ring.

Marshal Rocca follows a trail of investigations into a child's hospitalization and finds himself in Villa Bitosso, a place where he surprises the most influential notables of the city during a party. The photos taken by a reporter end up in all the newspapers and Marshal Rocca risks his career, having entered the villa without any warrant.

Marshal Rocca's police station is shaken by the events of Antonio Fait, one of the best men, involved by his drug addict girlfriend in a shady tour. The marshal comes to find out and, together with his group, carries out a blitz in an abandoned paper mill to catch the drug traffickers red-handed, without however finding any evidence. Claudia, Antonio's girlfriend, is accused of having tipped off the carabinieri and beaten by pushers, so much so that she lost the baby she was carrying. Antonio, who returns to the paper mill to take his revenge, is killed there: Marshal Rocca will not rest until he manages to capture the whole clan.

Domenico Scala, a violent and dangerous criminal, has escaped from prison: Marshal Rocca is in danger because the offender holds him responsible for his brother's suicide and is determined to take revenge.

Shortly before Rocca and Margherita's wedding, the woman's ex-husband reappears and will be found dead the next morning, together with a fragment of Margherita's dress. The wedding postponed, Margherita is accused of the crime, but, convinced of her innocence, Rocca investigates to find the real killers.

Found the body of a transvestite in the swimming pool of a health club, the most accredited hypothesis is that of a heart attack. Rocca, not believing this version, gives up his honeymoon with Margherita to find out the truth. The investigations prove the marshal right, revealing family intrigues and a homosexual relationship between the victim and his killer.

The rebus found on a note at the bottom of Rosa Bastiani's throat, a mother of a few months old baby stabbed in a park, kicks off complex and painful investigations, which will put Rocca and his colleagues to the test. Everything will become more difficult when one of the sisters of Carabiniere Banti will be involved. The marshal, putting his life at risk, will investigate Professor Aleppi, headmaster of the school, discovering a past made up of injustices, traumas and suffering. Once the case is resolved, Rocca and Margherita obtain custody of Bastiani's orphan.

The owner of a furniture factory, with the complicity of his lover, kills his wife by simulating a kidnapping. Marshal Rocca clashes with the victim's father who would like to pay the ransom. The man, after the discovery of his daughter's body, shoots his son-in-law killing him under the eyes of the marshal.

In the farmhouse of a former soldier, the skeleton of a soldier is found, killed because he wanted to report episodes of hazing. Another person responsible for the murder tries to drown his wife, at the time the victim's partner, who has discovered everything; Rocca saves her in extremis, but her husband takes the children of a nursery school hostage, also attended by Tommy, the marshal's adopted son. The courageous intervention of the child's natural father allows the criminal to be captured by the police.

A ruthless gang of Albanians kills the wife and daughter of Vinas, their compatriot and protected by the police. This takes revenge by killing himself, but also finding death. Cafiero, boss of the organisation, judging Rocca too dangerous for the clan, implements a plan to eliminate him: the car in which he was supposed to leave with Tommy and Margherita for their long-awaited honeymoon is blown up. Under the eyes of the marshal, who was saved only by chance together with his little son, his beloved wife dies.

After the depression following Margherita's death, marshal Rocca decides to put his uniform back on, with the intention of tracing the gang that murdered her; however, the anxiety of capturing them induces him to believe in false indications, which cost him his suspension from service. Determined to go it alone, he goes to Puglia, where the gang has a hideout, but Cacciapuoti alerts the police and the gang is routed. Rocca is seriously injured in the operation, but little Tommy will give him the strength to heal and, once reinstated in service, to receive a solemn commendation for the work done.

Margherita has been dead for three years now when Rocca meets Francesca, Tommy's teacher and daughter of one of his former superiors. The marshal investigates the death of the owner of a textile company in which children were exploited as workers; at first the father of one of these children accuses himself of the murder, but Rocca discovers that the real culprit is instead the son of the victim. The episode ends with the marriage between Daniela and Marco: a carabiniere and a policeman will live together!

The Marziales are an important family from Viterbo and in the garden of their villa a retired friend of Rocca's body is found, whose wife had died suspiciously, hit by a pirated car. Thanks also to the help of Francesca (who tutors a niece of the landlady), Rocca investigates the rich family, omertosa and hostile, reaching the solution of yellow.

A transvestite is the only witness to the murder of a man, found dead in a car outside a bowling alley. Even the waitress of the restaurant is later killed and suspicions seem to fall on her husband, but Marshal Rocca does not believe this is the case. In fact, the guardian of the restaurant is the real culprit, a murderer to avenge the death of his son.

A girl is found stabbed dead; she was staying in a Roman hotel. Rocca investigates her past and discovers that she had been kidnapped when she was ten years old: her parents, left broke following her payment, kill themselves. It is the kidnapper (owner of the hotel), whom the girl had recognized from a tattoo and who was following in her footsteps, who killed her. Francesca will figure out who it is from her tattoo and be saved by Rocca when the innkeeper tries to kill her.

A young pediatrician dies after drinking coffee in which a substance to which he was allergic was dissolved. Whoever killed him is not the father of a little dead patient, as it seems at first, but his nurse, in love with the doctor and unrequited. The woman had turned to a magician, later found lifeless in her home, to give her lover a love potion. Meanwhile, Francesca meets a man and informs Rocca that she intends to marry him.

Rocca is grappling with a series of crimes, which lead Mannino to think they are the work of a serial killer, who shoots a rifle belonging to a stolen batch of weapons. One of the victims is the perpetrator of the theft, Luca; the boy, together with a friend who worked at the gun shop, had planned to sell the rifles clandestinely. It is Rocca who discovers that the person responsible for the crimes is Luca's adoptive father, suffering from an incurable disease that made him lose his mind and led him to believe that his stepson had committed matricide. During the capture, the madman shoots the marshal who is saved thanks to his bulletproof vest.

Marshal Rocca tries to find the culprit of the murder of the parish priest of Santa Brigida, his friend, found killed in the same church. The killing of a journalist shortly afterwards allows the Marshal to discover that the culprit is the one who was posing as a simple witness to the murder of the parish priest.

A waitress, his former lover, is suspected of the murder of Michele Bono, found dead in a hotel. However, the subsequent death of a former police inspector leads Rocca to expose a gambling ring in the hotel. The assassin turns out to be the stepdaughter of Bono, her lover, whom she had killed with the motive of jealousy.