Sherlock Holmes investigates when young women around London turn up murdered, each with a finger severed. Scotland Yard suspects a madman, but Holmes believes the killings to be part of a diabolical plot.
In Tangier, disgraced American war correspondent Paul Kenyon, café dancer Rita and local entrepreneur Pepe join forces to battle a Nazi diamond smuggler.
Soon after a young woman breaks off her engagement to a doctor, the doctor is found murdered. Suspicion falls on his ex-fiancé and a pilot with a checkered past.
