An American writer goes to a remote Welsh manor on a $20,000 bet that he can write a classic novel like 'Wuthering Heights' in 24 hours. However, upon his arrival he discovers that the apparently empty manor has several rather odd inhabitants.
A space shuttle mission investigating Halley's Comet brings back a malevolent race of space vampires who transform most of London's population into zombies. The only survivor of the expedition and British authorities attempt to capture a mysterious but beautiful alien woman who appears responsible.