Four friends travel abroad to renovate a remote house. Upon their outward journey they make friends with a fellow traveler and his timid girlfriend only to find them turning up at the house, uninvited! All goes well at first as they enjoy the Continental sun until a drunken evening conversation turns bad and they see the true nature of their visitors. Unwilling to leave, events take a turn for the violent as the unwelcome guests generate a sublimely menacing atmosphere as events turn to kidnap and murder...