On the first day of opening, a small Italian restaurant is set on fire, killing three customers, and the unidentified survivor, who was injured and taken to hospital, somehow escapes. Detective Tono and his team, who are renowned for their interrogation skills, realise from evidence left at the scene that there are still survivors who have fled the scene. After obtaining information about the customers from the owner-chef, who was slightly injured, Tono visits the suspects, but they all seem to be acting strangely and are hiding something. The hidden relationship between the suspects, who seemed unrelated, is then revealed.