A spy detective story from the queen of classic crime fiction, whose stories never get old. Young scientists start to disappear strangely in the world. One of them is the promising researcher Thomas Betterton, whose case is put in charge by the intelligence officer Mr. Jessop. Shortly afterwards, he meets Hilary Craven, who is strikingly similar to Betterton's wife, who died tragically in a crashed plane. Jessop comes up with a ruse. Together with Hilary, they embark on a risky game to get on the trail of an organization that is trying to take over humanity.