Annoying American author Ken Magee (Desi Arnaz Jr) is set a curious bet by his publisher (Richard Todd), he is given 24 hours to write a novel and will win a $20K bet if he succeeds. As he needs peace and quiet, he is offered the use of a remote empty mansion in Wales. Reaching the mansion in a storm is not that easy but Ken makes it, and he sets up his typewriter. However, he immediately hears noises... the mansion is not empty after all.
In fact there is soon a whole dining room full of people there, including a man who claims to be the housekeeper (John Carradine), as well as some former inhabitants (Vincent Price and Peter Cushing) and a man (Christopher Lee) who is wanting to buy the mansion. However, there is a dark secret in the house involving a murder, and an imprisoned beast. Ken is joined by secretary Mary (Julie Peasgood) to try and discover the secret, and survive once the bodycount starts to rise...
This is a terrific film with it's cast of horror legends and a real old skool horror feel, it may be a bit slow to get going but once the action gets started it is pretty relentless. The film does have a rather large twist at the end which some will feel is inspired but others might feel a bit of a cop-out.