This is a tense thriller that overall is quite good but goes too far. It’s an early Hitchcock and serves as a good ‘before’ snapshot against which to compare his later, better works. The ending is much less satisfying than it could have been with a few plot tweaks, although the tension and plot reveals work well throughout.
Closest comparison: It’s like Notorious by way of The 39 Steps.
Setting: Drama
Plot: Espionage
Tone: Thriller