John Agar himself has said (in an online chat hosted by Turner Classic Movies) that this was a "very strange" movie. Strange yes, but also intriguing in a low-budget sort of way.
Of course, the film is a retread of the old hooker-with-a-heart-of-gold romantic fantasy. (A much more recent example: "Leaving Las Vegas.") The Cleo Moore character, who agrees to spend the night with Agar, isn't actually identified as a prostitute, but we get the idea. We also know that the more time these two tormented souls spend together, the more they will get to know each other, and themselves, with a generous helping of psychobabble along the way.
But once you get past the obviousness of the film's rather incredible premise, not to mention a mawkish opening theme song, things get interesting in this modest, offbeat Hugo Haas opus. Moore and Agar deliver performances that are sincere, if at times a bit theatrical - he plays a condemned man who's mad at the whole world; she plays a suicidal woman who, despite her despair, is still capable of hope. Some of Moore and Agar's scenes together are nicely played out in long, continuous takes.
Unfortunately, the movie is nearly ruined by a frustrating, unresolved ending. Haas may have been trying for some kind of dramatically suspended moment, but it makes you want to yell at him: Tell us what happens next!!!