The Scarlet Claw is a 1944 Sherlock Holmes movie, starring Basil Rathbone and Nigel Bruce as Holmes and Dr. Watson respectively.
While in Canada at a convention, the duo get involved in a series of murders in the village.
The locals believe it is the work of a monster but Holmes is more grounded.
It turns out to be Ramson, an escaped prisoner with a new identity who is seeking revenge.