In the North of England, teenage girls Sue (Michelle Holmes) and Rita (Siobhan Finneran) earn themselves some extra pennies babysitting for middle-class suburban couple Bob (George Costigan) and Michelle (Lesley Sharp). Bob offers to drive the girls home, but instead takes them over to the moors, where he proposes a menage à trois. All three enjoy the experience so much that they begin to repeat it on a regular basis, but complications soon ensue