Detective Katayama has two major problems that prevent him from being a first-class police officer: on the one hand, he feels panic in the face of blood, only to see him faints. On the other, he is so shy that he is unable to talk to women. In spite of this, she must join the investigation of the murder of a university student and she will be entrusted with the supervision of a female residence of the university. His life will take an unexpected turn when he meets a professor who has a pet whom Holmes calls and who, to the detective's surprise, is not an ordinary cat ... This is the first installment of a well-known series of books that provoked fans to the mystery novels will increase dramatically in Japan. A mixture of comedy and mystery that has become an emblematic work for readers and that has led to his character, the cat calico Holmes to be one of the most beloved and popular characters of Japanese fiction.