I also give this b/w thriller high marks. The story is good and as mentioned in another comment, the set is terrific and the atmosphere of suspense and intrigue sustains your interest. You begin to suspect that something's not quite right, but you're still surprised when it is revealed. One of my favorite actors, whom I had the pleasure of knowing briefly, was Edward Mulhare, and this is one of the few chances he was given in this country to show his appeal. Whitman reaffirms that he was a very underrated actor, despite his Oscar Nomination for "The Mark", having ultimately been relegated to B-Westerns and some unexceptional, though frequent, TV guest appearances. All in all, a very well-spent 74 minutes or so.