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.

A group of tourists from Hong Kong visit the Philippines on holiday and run into ghosts.

Treasury employee Fatty (Eric Tsang) discovered that bags of used 30 million in Hong Kong Dollars have not been incinerated due to a system error; therefore, he hatches up a plot to grab the doe before they are burned. He seeks his friends Mark (Mark Cheng) and Tomboy (Anglie Leung) to help him with the heist; but, they also enlist actual thief Baldy (Karl Maka), who had just been released from prison, to double the assistance with his thievery skills. But, Baldy wants the money for his own and to share it with love interest Siu-Fung (Paula Tsui). Hot on their trail is a hothead inspector (Ching Wong) and a nun, Sister Maria (Brigitte Lin), who wants to save them for redemption.

A seasoned cop and his rookie partner try to solve the murder of a heroin trafficker.

Two friends who own an investment firm turn to a policeman friend for help when they are framed for robbery by a gang of antiquities smugglers.