The Prowler (1951) is a first rate noir-- very tawdry with adult sexual themes. I'm surprised that Van Heflin agreed to play such a nasty character. Some actors of his stature wouldn't. Wasn't Evelyn Keyes lovely?
The screenplay was written by commie Dalton Trumbo, but credited to a friend of his. Even the director, Joseph Losey, was a Fellow Traveler; and rather than face the House Unamerican Activities Committee, he fled to England, where he had a good career.
Yeah, some of the music used for '40s and '50s films WAS overwrought, as you say, but that was standard for the era. They seem to want music in the majority of the film, I suppose to enhance the mood. I'd love to know why Lyn Murray was hired to do the score. He'd primarily been a radio and TV composer, and not at all known for noir.