On board the Orient Express as it pulls out of the Gare De Lyon is a man named Poole, who has stolen an important political diary and is being pursued by two people who want it back. Valya wants the diary to avenge her father's political assassination, while Zurta is the thief who acquired it for her. Poole throws them off the trail by hiding the diary in the compartment of pompous author Alastair McBain.

John Gilling directs this British crime thriller starring John Bentley and Rona Anderson. Freelance photographer Barbara Leyland (Anderson) is working for Clayton Advertising when the company MD's wife falls to her death in an apparent suicide. However, someone believes Barbara may have photographic evidence that reveals the real killer and sets about making her disappear. Detective Pete Fleming (Bentley) is hired to investigate the mysterious death and is determined to find the killer before Barbara is the next one to meet an unfortunate fate.