This episode's case includes another murder. The unemployed father of a little boy is found dead because of a huge wound in his stomach. The step-father of one of Shinobu's pupils is suspected, as he is the landlord and the man was 3 rents over. However, he is not the type to commit a murder. Maybe, the son of the man can help to solve the case, but he went missing, so Shinobu starts a big search for the little boy.