In response to a 30-day medicall trial, 5 young couples are driven to an old castle in an unknown location. If any couple chooses to leave before the 30 days are up, they will forfeit their fee: 20,000 pounds per couple. Strange noises, mysterious, unexplained events begin to take place in and around the castle, which the group assumes is part of the package. They soon find out they're wrong.
