Jandy Hardesty’s review published on Letterboxd :
A much-needed rewatch, since I didn't remember hardly anything about the film but the premise. Great to revisit. A lot more comedy than I remembered, but most of it works - a pity some of the jokes get buried because of the poor sound quality (and this is on HuluPlus, which I'd assume is the Criterion print, but maybe they're using the public domain one).
I'm glad I saw Night Train to Munich not too long ago - I'd heard the two films are sort of cousins, in a pre-war-espionage-on-trains and during-war-espionage-on-trains kind of way. This one is more mystery, whereas NIght Train is more action, though. Both very solid films, and would make a great double feature.