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. Shes 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. Its only a minute until the train moves on, but its enough. Now everythings changed. Now Rachel has a chance to become a part of the lives shes only watched from afar. Now theyll see; shes much more than just the girl on the train...