Lugano, Switzerland. Titta Di Girolamo is a discreet and sullen man who has been living for almost a decade in a modest hotel room, a prisoner of an atrocious routine, apparently without purpose. His past is a mystery, nobody knows what he does for a living, he answers indiscreet questions evasively. What secrets does this enigmatic man hide?
Accio and Manrico are siblings from a working-class family in 1960s Italy: older Manrico is handsome, charismatic, and loved by all, while younger Accio is sulky, hot-headed, and treats life as a battleground — much to his parents' chagrin. After the former is drawn into left-wing politics, Accio joins the fascists out of spite, but his flimsy beliefs are put to test when he falls for Manrico's like-minded girlfriend.
In Italy, a woman fears her sister has been kidnapped; Inspector Enzo Avolfi fears it's worse. They team up to rescue her from a sadistic killer known only as Yellow.
