The story concerns a valuable string of pearls which is purchased by a wealthy and eccentric financier. The handsome young son of the jeweller is assigned to deliver the pearls to the financier's vacation home in a desert area of California. Because of his long association with the owner of the pearls (before joining the police force, he was her houseboy), Charlie Chan travels from Hawaii to California to also look after the pearls. After two mysterious deaths, first of a Chinese-speaking parrot and then of the household's Chinese man-of-all-work, Charlie Chan masquerades as a pidgin-speaking cook named Ah Kim and works undercover to solve the crimes. Along the way, the jeweller's son meets a beautiful young woman who works as a location scout and he decides to stay in the California desert.