"Case number.." is a book in the genre of a classic detective story. In the book, a murder for hire takes place, and subsequently the murderer is found and a lawsuit is filed against him. After the trial, the killer is sent to a colony for 7 years. In an attempt to escape from prison, he was caught and put in a punishment cell. After serving his time, he gives up his murder career. He got a job, got married and had children.