There are some relationships so taboo they're irresistible.
After some years of tension, Richard begins a sexual relationship with his sister Natalie. Now married, the relationship proves dangerously obsessional.
Alan Rickman
Sinclair
Clive Owen
Richard
Saskia Reeves
Natalie Bryant
Karl Johnson
Colin
Lesley Sharp
Jessica
Kate Gartside
Paula
Karen Knight
Philippa
Niall Buggy
Geof
Campbell Morrison
Scotsman
Annie Hayes
Receptionist
Maxwell Hutcheon
Interviewee
Geraldine Somerville
Natalie's Boss
