Diego Viani is a former robber, well-known in the 1980s for his "unarmed" heists. His best friend is Michele Ragusa, a shabby private investigator scraping by on cases of marital infidelity. Working alongside him is Alex, an unpaid intern—a clumsy "mama’s boy" who dreams of becoming a detective despite having no talent for it. Everything spirals out of control when Diego’s past resurfaces in the form of Salamandra, an old accomplice. Salamandra accuses him of stealing the loot from their final job: five billion lire in gold bullion that vanished into thin air. When Salamandra dies under mysterious circumstances, Diego becomes the prime suspect. Commissioner Castrone, fueled by a long-standing personal vendetta, is convinced of his guilt. The only person who believes in Diego’s innocence is Ragusa, who decides to investigate with the help of the unlikely Alex.