Humphrey Bogart was and is a legend, but not because of this movie.
In a bizarre, but fascinating bit of casting, Humphrey Bogart stars as a vampire in his only horror film role. After a murderous doctor is executed, he is revived with human blood–and soon people with that blood type begin to disappear. When an eager reporter stumbles across a popular actress who was thought to be dead, he can’t help noticing that her skin is unnaturally pale and that she keeps her face concealed beneath a long black veil.
The Rh blood group system was discovered in 1937, 2 years prior to the making of this movie.