Mikey is a seemingly naive little boy, but every family that adopts him always has a series of unexplained "accidental" deaths, and then he is adopted by a new family. At the beginning of the film, the adoptive mother teaches Mikey for playing with fire in the house. As a result, he drowns his sister in the swimming pool, electrocutes her while she is in the shower and kills her adoptive father with a bat. The police did not suspect Mikey because he was only 9 years old. The police listened to his story and thought that someone had broken into the house and killed the family. Mikey was taken to a new home. He falls in love with his neighbor's beautiful big sister Jessie, but Jessie is not interested in him because they are 15 years apart and Jessie has a boyfriend. A teacher at the school noticed Mikey's abnormal behavior and began to investigate him. As a result, Mikey electrocuted Jessie's boyfriend in the bath, then killed his adoptive mother, teacher, headmaster, and almost killed Jessie, finally causing a gas explosion to burn his adoptive father. Mikey faked the illusion that he had also been burned to death. At the end of the film, Mikey walks into a new family again under the pseudonym Josh.