The Girl on the Train(Paperback)

"The Girl on the Train" Taken from the flap of the book:
Every day 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.
Until Today
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 ...