The Adventuress (1946)

Determined, independent Bridie Quilty comes of age in 1944 Ireland thinking all Englishmen are devils. Her desire to join the IRA meets no encouragement, but a German spy finds her easy to recruit. We next find her working in a pub near a British military prison, using her sex appeal in the service of the enemy. But chance puts a really vital secret into her hands, leading to a chase involving Bridie, a British officer who's fallen for her, a German agent unknown to them both, and the police... paralleled by Bridie's own internal conflicts.