Cauldron of Blood (Original title: El Coleccionista de cadáveres/ The Corpse Collector), also known in USA as Blind Man's Bluff, is a 1970 horror film filmed in Spain and directed by Santos Alcocer, credited as "Edward Mann". The film stars Boris Karloff and Viveca Lindfors. It was filmed in the Spring of 1967, but only released theatrically in 1970 in Spain, a year after Karloff's death. It was later theatrically released in the US by Cannon Films in August, 1971.