Corrado Cattani replaces the murdered Palermo chief of police Marineo.

Cattani tries to settle the score with his enemies.

Police Inspector Cattani fights a losing battle to save his loved daughter's sanity, after what she suffered (see "La Piovra", original mini-series). He loses her, and his only trusted magistrate in the fight against The Octopus.

Cattani discovers what happened the night Marineo was murdered, but the information is dangerous.

Cattani focuses his investigation on rich business men, while his private life is getting more and more difficult.

Cattani sets a trap for some of the key mafia players, resulting in the kidnapping of his only daughter.

Cattani hides the truth about his daughters disappearance from his wife and colleagues while at the same time fighting opposition in his work place.