Triest police commissioner Proteo Laurenti investigates the bomb which killed Croatian-born a well-loved delicatessen owner and his family in his suburb villa. His father, dodgy Antonio Gubian, warns he's ready to take revenge. Proteo's unruly student son Marco keeps getting into trouble, but also opens father's eyes to police prejudice. The luxury fish supplies suggest possible motives in smuggling, post-Yugoslavian war profits and drug trade. A chilling execution murder follows.