Charlie (Warner Oland) is in Shanghai to investigate an opium smuggling ring. At a welcoming banquet, prominent local official Sir Stanley is killed by a booby trapped right in front of Charlie who begins the investigation. However, soon Charlie himself is in danger and kidnapped by a shadowy mob, though he is rescued by Number One Son (Keye Luke).
There are a number of suspects, could Philip Nash (Jon Hall) be behind the attempts on Charlie's life or is the ringleader someone completely unexpected...
An excellent and energetic entry in the Charlie Chan series with more action than often is the case, including a rather juicy flying leap by Number One Son.
