Twisted twins James and Louise meet a man at a nightclub who invites them to join a secret society, if they can commit a crime tailor-made for them. Meanwhile a serial killer is terrorising West London. Victims turn up in the Grand Union Canal or in wheelie bins. When the twins struggle to complete their assignment, the trail of bodies gets closer and closer to home. How many members of the household are they prepared to lose before they act? Who will be next?