There is no doubt in Thomasina Elliott's mind that her oldest schoolfriend is a creature of habit. So when, after three years of regular correspondence, Anna's letters suddenly stop, she becomes concerned. And even more so when it transpires that her friend has disappeared without trace, in extremely odd circumstances.
My name is Ruby. I live with Barbara and Mick. They're not my real parents, but they tell me what to do and what to say. I'm supposed to say that my bruises and black eye came from falling down the stairs. But there are things I won't say. I won't tell them I'm going to hunt for my real parents. I'm going to be with my real family. And I'm not going to let Mick stop me.'