Newly extradited to England from California on charges of fraud, Philip Page faces a long prison sentence. The police are already convinced of his guilt, having been furnished with apparently watertight evidence by an anonymous informant, but Page believes he has been framed. Released on bail, he sets about unmasking the mystery witness. When maverick investigator John Raven is called by one of the suspects, Page and Raven soon realise they want the same thing. So begins a gripping race against time to expose the source of the evidence and clear Page's name.