Conan and Subaru deduced that the culprit was Senba who made a blackjack using a sock and a heavy iron ball as a murder weapon. He then threw it along with the colored ball on the victim's roof to confuse Hiyama’s bodyguards. Senba confessed that he committed the crime for revenge. He discovered that Hiyama planned the accident so that he can persuade his wife to sell him their land, where their candy shop was built, without his authorization.