You leave your kids with a friend. Everyone does it. Until the day it goes wrong.Single mother Callie has come to rely heavily on her best friend Suzy. But Callie suspects Suzy's life isn't as simple as it seems. It's time Callie pulled away - and going back to work is just the first step towards rediscovering her old confidence. So why does she keep putting off telling Suzy about her new job? Suzy and Callie live close to each other on a typical cramped, anonymous London street. Neighbours seem to move in and move on before you have even learned their names. Callie's increased sense of alienation leads her to try to befriend a new resident on her street, Debs. But Debs is anxious, odd. You wouldn't trust her with your child - especially not if you knew anything about her past.