Danger Signal
directed by Robert Florey
directed by Robert Florey
This short movie doesn't reach the level of a true film noir though it certainly looks like it thanks to the fantastic cinematography by James Wong Howe, a rarity in early Hollywood, a Chinese-American cinematographer. Howe's work, along with some of the acting, gives the film a gravitas that unfortunately falls apart at the ending or when you closely examine it.
But since the movie moves fast it's entertaining enough I guess. In the sitcom Seinfeld there was an episode where the title character wanted to stop dating one roommate and switch to dating the other. His solution was to propose a threesome in the hopes that his current girlfriend would be disgusted and dump him while the other lady might be intrigued enough to become his new girlfriend.
His plans fell through when both women expressed interest. Danger Signal was made in 1945 so it lacks lurid sex, but it does have a man, a far more dangerous man than the hapless Seinfeld character, who wishes to switch from one roommate (here the women are sisters) to the other. We already know that this man Ronnie Mason (a perfectly cast Zachary Scott) is no good because we see him leaving his murder victim, after stealing her wedding ring and some cash and placing a fake suicide note where the authorities are sure to find it.