Passenger to London

A very solid and relatively short British espionage film. A government agent is returning from France with secret blueprints that were stolen from his government. On the train ride home, thieves break into his compartment and murder him. But the agent anticipated his attackers and managed to hide the blueprints.

The British government sends out another agent, this time Frank Drayton (John Warwick) tries to recover the missing blueprints. The viewer knows the blueprints have been hidden in the luggage of a female passenger on the train. While Drayton works to recover the documents he also sets out to learn who murdered his fellow agent.