Many of the comments here are written about the hacked up version of 'A Virgin Among The Living Dead' so ignore them. This is actually a very watchable movie, not the best Jess Franco I have seen, but still above average. More an erotic fantasy than a horror movie per se, it will appeal to fans of 60s/70s Euroschlock like 'Nude For Satan' and Franco's classic 'Vampyros Lesbos'.
The stunningly beautiful Christina von Blanc plays the lovely innocent Christina Benson, who is summoned from boarding school in England to the reading of her father's will in a spooky castle. She never really knew her father, or had previously met her bizarre relatives who live in the castle, which according to the locals is deserted. It doesn't take much to work out her family's "secret", the title tells all. Christina however, is a bit slow to catch on. She spends most of her time wandering around in a daze, often naked (great news for us viewers!), and increasingly unable to tell dream from reality.
There's not much action in this movie, and very little horror, but it has an almost Argento-like nightmarish feel to it, and like most of Franco's output, is very stylish despite the obviously low budget. The sight of the gorgeous Ms. Blanc is more than enough for me to recommend this movie. One look at her and any failings 'A Virgin Among The Living Dead' has will quickly be forgotten! An enjoyable fun movie.