Sammo Hung plays three different characters: Fatty, Fatty's father and Fatty's grandfather, Hung Kau. Fatty is a hotel worker, yearning for sudden wealth. Therefore, he, and his co-worker, enter the gambling world, to the dismay of his father. When Fatty hits rock bottom, the ghost of his grandfather resurrects to help him. However, Fatty learns that his grandfather was murdered, therefore, he will stop at nothing to avenge his death.

The Gambling Ghost

The "walk in" of the title refers to one person allowing another's soul to take possession of his body at the time of death.