Charlie Chan at the Circus

Charlie Chan at the Circus is the 11th film produced by Fox starring Warner Oland as Charlie Chan. A seemingly harmless family outing drags a vacationing Chan into a murder investigation.

Charlie Chan takes his wife and twelve children on an outing to a circus after receiving a free pass from one of the owners, Joe Kinney. Kinney wants Chan to find out who is sending him anonymous threatening letters. Nearly all of the circus workers are suspects, since Kinney is very unpopular. However, when Chan goes to meet him during the nights performance, he finds the man dead, seemingly killed by a rampaging gorilla who somehow escaped from his cage.Lieutenant Macy takes charge of the investigation, assisted by Chan and his overzealous eldest son Lee, who also takes the opportunity to unsuccessfully romance Su Toy Toshia Mori, credited as Shia Jung, the contortionist. On Chans advice, Macy lets the circus continue on to its next stop, with the trio tagging along. During the train ride, an attempt is made to murder Chan with a poisonous cobra. ........

Source: Wikipedia