A few months since Pietro Zinni's gang got caught in the Sopox production laboratory, each of them is locked up in a different jail. From Regina Coeli jail, Pietro keeps warning the authorities about a synthesized nerve gas and he is ready to make a killing, but no one takes him seriously. So he puts in for a transfer to Rebibbia to meet Murena, who has useful information to intercept the murderer. After which, Pietro wants to get the gang of university researchers back together: the perennially unemployed (or detained) most brilliant minds around.