The Sunday Times bestseller from the author of Freedom and The Corrections Pip Tyler doesn't know who she is. She knows that her real name is Purity, that she's saddled with student debt and a reclusive mother, but there are few clues as to who her father is or how she'll ever have a normal life. Then she meets Andreas Wolf - internet outlaw, charismatic provocateur, a man who deals in secrets and might just be able to help her solve the mystery of her origins.