Twilight Investigation (2011)

Encore (Wong Hei) is a private detective who works your normal investigation cases - missing items, missing persons, adultery, and the like. While investigating an adultery case involving a group of models, Encore meets 得仔 (Linda Chung), a o靚模 whose mother disappeared 20 years ago. After 得仔 gets herself into a drunk driving accident, it seems no one can see her except for Encore. With no one else to turn to, 得仔 sticks with Encore and asks him to help search for her mother. A series of investigations is set off as Encore helps 得仔 with her invisibility predicament and 得仔 uses her new found abilities to help Encore's investigations.