The original broadcast was on the TVB Jade network with 45-minute episodes airing five days a week from 31 January to 26 February 2006.

Sze Sai-lun, the newly appointed magistrate of Kong-do County, accidentally encounters a spirit, enclosed in a magic pillow, who helps him solve cases.

Due to the drama's popular success, a follow-up sequel, A Pillow Case of Mystery II was produced and was released in 2010.

After a series of unresolved cases, the townspeople begin to see him as pathetic and useless.

While Sai-lun was searching for evidence by a hillside, he accidentally injures himself, dropping blood on a mysterious pillow.