Yellow Canary (1943).

Richard Greene and Anna Neagle
in Yellow Canary (1943)

In Yellow Canary, a well-to-do Nazi sympathizer (Anna Neagle) traveling to Canada becomes a focus of both British and Nazi agents, with the fate of a British convoy in the balance. The film is based on a story by Pamela Bower (daughter of the film's director, Herbert Wilcox, and stepdaughter of Neagle) and a screenplay cowritten by actor-screenwriter Miles Malleson. Costars include Richard Greene, Margaret Rutherford, and Valentine Dyall.