The train Rachel catches every morning runs along the back of the road where she used to live. There lives a couple who looked in love, until she saw the wife kissing another man. Show more

Commuter Rachel daydreams about the loving couple she watches every day from her train window. Show more

Rachel learns that the woman she called Jess - whose name was actually Megan - has been missing for several days, and she may be the only person who knows about her secret lover. Show more

Rachel finally tells the police about the man she saw Megan kissing. Meanwhile we learn that long before she disappeared, Megan was deceiving her husband. Show more

Rachel tries to recover her memories, Anna grows increasingly suspicious, and Scott comes to an unpleasant realisation. Show more

Several weeks after her unexplained disappearance, Megan's body is found buried in Corly Woods. Rachel struggles to recall what happened to her on the night she was attacked. Show more

Claiming to be a friend of Megan's, Rachel visits Scott at home. They grow closer, but will he discover her lies? Show more

Hoping to unearth the half-forgotten memory of what happened to her on the night Megan disappeared, Rachel books a therapy session with Dr Kamal Abdic. Show more

Rachel is trying to retrace her steps. At first she believes that after she had argued with Tom in the underpass, he had driven off with Anna. But where was baby Evie? Show more

Events reach a thrilling conclusion as Rachel remembers who it was who attacked her that Saturday night. Megan confesses all to Scott and storms out of the house. Show more