Bloodlust

A bus drives 5 young couples to an old castle in an unknown location, they have responded to an advert looking for people to take part in a 30-day medical trial. The company running the experiment, led by the programme co-ordinator, explains there will be no contact with the outside world. The group are free to leave at any time, but if they do, they will forfeit their fee: £20,000 per couple. Mysterious, unexplained events occur around the castle and strange noises are heard in the middle of the night. At first the group are skeptical, they think the company is creating the illusion of a haunting to test their reactions, until it is revealed there is something more sinister involved.