Kogoro inadvertently gets caught up in a bank robbery and chases an armed robber onto a building rooftop. Kogoro, who has a fear of heights, enters a state of shock and loses the robber. The police eventually arrest the robber, but the robber tossed the gun while fleeing. Two days later, Taizo Sakaki, a futures trader accused of fraud, is shot in the shoulder and leg by a person riding a motorcycle. The gun used in the incident is the same one thrown away by the robber. Kogoro determines the identity of the individual who picked up the missing gun, but the case is not over yet.