John is a pure i person who stays at home every day and writes puzzle books. One night, his sister-in-law suddenly ordered a car to pick him up at home, saying that his police twin brother had disappeared, and asked him to pretend to be his brother and enter the police station to look for clues... John, like a fish out of water, made a lot of jokes, but his talent for solving puzzles successfully helped him solve one murder after another. [Original introduction of the Fish and Chips Subtitle Group, please indicate the specific source for reprinting]