THE NUMBER ONE BESTSELLER. YOU DON'T KNOW HER. BUT SHE KNOWS YOU. Rear Window meets Gone Girl , in this exceptional and startling psychological thriller 'Gripping, enthralling - a top-notch thriller and a compulsive read' S J WATSON, bestselling author of Before I Go To Sleep Rachel catches the same commuter train every morning. She knows it will wait at the same signal each time, overlooking a row of back gardens. She?s even started to feel like she knows the people who live in one of the houses. 'Jess and Jason?, she calls them. Their life - as she sees it - is perfect. If only Rachel could be that happy.And then she sees something shocking. It?s only a minute until the train moves on, but it?s enough. Now everything?s changed. Now Rachel has a chance to become a part of the lives she?s only watched from afar.Now they?ll see; she?s much more than just the girl on the train...