The menace of Li-Sin

When Doctor James Hartley meets up with the son of an old friend, he discovers that young Jack Mallory is in fear of his life. Having stolen the sacred Black Idol from the Temple of Tsao-Sun in China, he is being followed by emissaries of the Temple priests. Mallory is advised by Hartley to return the idol, but then it's stolen, sparking a series of murders. Both their lives, and those of their families and friends, are in danger ...