Kathryn and Annabel are travelling home from university one evening when their car breaks down on a country road miles from anywhere. They abandon the car and set off on foot, heading towards the lights of what they think is a village, but turns out to be an impressive school building. To their surprise, they are met by an irate member of staff who appears to know their names. The pair of them are taken to see the headmistress in her study, where they are treated as two truanting schoolgirls and caned thoroughly. A grim-faced matron escorts them to their room. However, the girls are determined not to stay a moment longer than they have to, and as soon as it is light they make their escape by climbing down the drainpipe. They find their car where they left it ... but something very strange is happening...