Rich old man Sit (Lau Hark-suen) desires for the maid Ku (Fung Wong Nui). Ku thus concocts a scheme with her husband Wong (Sima Wah-lung) to swindle money out of her lascivious boss. However, Sit is stabbed to death during their secret rendezvous and Ku has to flee into hiding. Detective Lui Hak (Law Kim-long) investigates the murder at Sit's house and arrests Wong who has a sharp knife in his possession. Bearing witness to the murder, their daughter Bo-bo fights to prove her father's innocence. Upon receiving a score of mysterious phone calls revealing Ku's whereabouts, Lui lures the woman out with Bo-bo (Fung Bo-bo) as bait, subduing and detaining the suspect. Adapted from an extremely famous radio play, the film version is an even more suspenseful and enthralling dramatisation of the original. Full of entertaining and socially conscious aspects, the rare gem is still deeply rooted in the common ethics of Cantonese films.

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