The Yellow Canary (1944)

Synopsis
The Yellow Canary was one of several wartime collaborations between British producer-director Herbert Wilcox and Hollywood's RKO Radio Pictures. The film stars Wilcox's wife Anna Neagle as pretty aristocrat Sally Maitland. Having alienated many of her friends with her prewar Nazi sympathies, Sally continues hobnobbing with the Third Reich once war has been declared. Actually, her pro-German activities are a sham; she's actually working hand and glove with the British government to smash an Axis spy ring in Canada. Along for the ride is British intelligence officer Jim Garrick (Richard Greene), who ultimately falls in love with Sally. There's a "mystery" angle to the plotline of The Yellow Canary, but it is largely ignored when the story takes a melodramatic turn in the last few reels. ~ Hal Erickson, All Movie Guide