Pre-war intelligence man Tommy Blythe interrupts his honeymoon to investigate the discovery of vital Air Ministry blueprints on a woman killed in a London road accident. The trail leads to a boarding house in Notting Hill and its varied tenants.

Secret agent Tommy Blythe is called away from his honeymoon to find the spy who is leaking new aircraft designs. He finds the spies living in an old boarding house, but his case is almost foiled by the untimely appearance of his new bride Louise.