Still powerful after all this time. I remember, when first seeing this in the early sixties, being outraged that I was asked to pay to see what I compared to watching people have their teeth pulled. Not having seen it since till now I have always remembered that scene, but also the poignant lead in the lifelike mask that floated about the palatial dwelling like some surreal being and always that dreadful sound of the caged dogs barking. Much emphasis on the sounds of things being dragged, scraped and dropped - steel and stone and a dark menacing outside from whence young girls are brought in the name of science and in particular a new face for the masked one. Extremely strong central scene and always the threat of more. The police and routine hospital scenes give brief respite but for most of this masterpiece one is held in awe and horror right to the stunning finale.