Effective, vaguely Gothic chiller with a young but moody James Mason convinced he turns into a killer of small furry animals when the moon is full. Cute blonde Joyce Howard turns up to try and set him straight, but not without first uncovering a skeleton in his closet. Leslie Arliss's screenplay wanders a little at times, but builds to a good finale. Wilfrid Lawson stands out as a not-quite-right handyman with a pet capuchin.