Blood of the Vampire

When Dr. John Pierre (Vincent Ball) is falsely accused of practicing medical heresy, he is sent to a remote castle prison run by Dr. Callistratus (Donald Wolfit), a maniacal scientist who specializes in strange diseases of the blood. Aided by violent prison guards and a creepy hunchback, Dr. Callistratus proves to be much more than he seems. (oficjalny tekst dystrybutora)