A tedious effort from not-yet great director Budd Boetticher and pretty but not-yet un-bland actress Nina Foch, this movie is, as one of the other reviewers notes, is the quintessence of a certain kind of B movie. It's just not the good kind. And a promising premise and an overactive fog machine is wasted.
Basic plot -- Nina, a nurse on leave from wartime duties on account of her nerves, has a nightmare. She meets a dashing fellow at the resort where she's giving her nerves a breather, and realizes he's in the dream, even though she's never met him before. Meanwhile, it turns out our dashing guy is working as a spy, and is about to go on an-extra secret, hush-hush mission that must not fail.
Of course, there are Nazis. And plot holes. And smart people acting in a fashion most likely to get them into entirely unnecessary scrapes, so that the running time can be spun out past an hour. At the end, the movie becomes a contest between which group of spies can act more foolishly. If the FBI and OSS had acted like this crew, we'd have lost the war in '42.
The movie itself is rather flatly shot (despite the best efforts of the fog machine) and the acting -- as it seems to be in many of the Columbia Bs TCM has been showing lately -- is curiously unengaged. It's less stylized than what one might find from a similarly budgeted Warner Bros movie, but also less fun to watch.
Boetticher's strength, of course, is a rather matter of fact style which allows the strong stories and acting in his Randolph Scott westerns to come to the fore. Maybe the problem here is that such a style is not going to work when the script is lousy and the actors tired from their five film a year schedule.