Agatha Christie's Partners in Crime

The Secret Adversary, Part 1

On a train from Paris, Tommy and Tuppence meet an agitated young woman who mysteriously disappears. Tuppence is determined to find her. Major Anthony Carter, Tommy's uncle who works for the "Third Floor," a branch of British military intelligence, warns them off. But soon the pair is searching for the woman, a secret recording, and a Soviet hit man named Brown.