Li (Sam Hui) works at a sanitarium as a male nurse, and Ah Tim (Michael Hui) is a handy man. One day, a bearded old man is sent into the sanitarium with a large bag. Ah Tim manages to steal the bag, and finds antique fragments inside. When the old man dies, the pair learn from his daughter that there is a sunken vessel that is loaded with much more than they already have, so they decide to go after the sunken treasure.

The kingpin of the Manix Private Detective Agency and his fellow detective solve cases together.

During the Japanese occupation of Hong Kong, the soldiers had a clubhouse, where, on V-J Day, they committed seppuku. Now it's a police station, and its inhabitants burn dolls to keep the souls at peace. However, tonight is the Ghost Festival, when ghosts are allowed one night's leave, and the Colonel has risen, turning those he bites into vampires.