Discover the haunting and deeply chilling debut thriller which has now sold more than six million copies worldwide.Memories define us.So what if you lost yours every time you went to sleep? Your name, your identity, your past, even the people you love - all forgotten overnight. And the one person you trust may only be telling you half the story.Welcome to Christine's life.______________PRAISE FOR BEFORE I GO TO SLEEP:'A cracking good thriller' Lionel Shriver'Thrillers seldom come much better than this. Loved it' Joanne Harris'So high-concept, so ambitious and so structurally brilliant' Sophie Hannah'A deeply unsettling debut that asks the most terrifying question - what do you have left when you lose yourself?' Val McDermid'I loved it from start to finish' Mo Hayder'Brilliant in its pacing, profound in its central question, suspenseful on every page' Anita Shreve'Quite simply the best debut novel I've ever read' Tess Gerritsen