Forde Beebe was a longtime writer and director who doesn't get much love -- the Buck Rogers serials excepted; most of his sound work was in the serial and B westerns, which usually don't impress. However in 1942 he shot Night Monster in less than two weeks for Universal. And it's a fine creepy-crawly with a good slow build-up and some fine atmospheric lighting by Charles van Enger. Bela Lugosi and Lionel Atwill were top-billed for marquee value, though Lugosi has few lines as the servant of the house, Rolf, and Atwill is the first person killed inside the house, so there really is no truth in advertising here.
Three doctors are summoned by wealthy Kurt Ingston (Ralph Morgan) to spend a few days at his mansion for possible endowments for their research. That's odd since the three doctors could not stop Kurt from ending up in the state he is in now - an arm and both legs partially amputated. Kurt's sister has summoned a fourth doctor, Dr. Lynn Harper, for completely separate reasons. Harper is a psychiatrist. A mystic, Agor Singh (Nils Aster), is a resident of the Ingston home, helping Kurt deal with the reality of his condition. And then guests as well as some of the servants are found strangled, usually in their rooms but sometimes outside. So the search is on to discover who the murderer - the titular night monster - might be.
This is a well-done horror film that, despite not having any big names who have many lines or who are onscreen for very long, was quite engaging with an interesting and unusual angle. With Leif Ericson as a big galoot chauffeur who could be the poster boy for the Me Too movement 70 years ahead of schedule. 15 minutes in I was rooting for the Night Monster to get this creep he was so awful!