The Secrets of Wu Sin is a 1932 American pre-Code mystery film directed by Richard Thorpe and starring Lois Wilson, Grant Withers and Dorothy Revier.

[1] James Manning, a newspaper editor, is visiting a drugstore when a young woman, Nona Gould, tries to buy poison, allegedly for a sick dog.

They discuss Manning's ongoing attempt to expose a criminal gang that is smuggling Chinese workers into the country.

Working on separate tracks, Nona and Morgan discover that Wu Sin is behind the smuggling ring, which is financed by Roger King.

A meeting of the Tong sentences him to death, and Wu Sin tells Charlie that he has been chosen as the assassin, the price of Miao Lin's hand.