A man is killed during a celebration. The investigation, which seems to involve the Monster of Bolzano, is entrusted to the young PM Kofler supported by the mysterious inspector Costa.

Despite their differences in character, Kofler and Costa understand that they must team up to solve the case, even if the investigation puts a strain on Paolo's love life.

While the relationship between Paolo and Eva becomes increasingly personal, the theft of a painting sees a painter friend of Kofler among the suspects. Eva tries to defend the girl at all costs.