Kogoro celebrates at a bar after winning a horse race bet. He, and three customers, leave the bar for a short while before returning and finding the hostess has been killed by a knife. After Conan investigates, he reveals the culprit to be customer Masao Shinohara. Conan explains the hostess was knifed through a slit in the wall from the back of the bar and reattached the handle to the knife when he and the others discover her body. Since the distance from the ATM to the back off the bar is considerably short, his alibi is annulled. As evidence he is the culprit, Conan reveals the rust from the knife will match the one found on his ATM receipt. Shinohara confesses and reveals the hostess had been blackmailing him to steal fish from the factory.