La chica del tren

Every day Rachel takes the same commuter train, and every day she sees the same couple--Jess and Jason she names them in her mind--eating breakfast on their deck. One day everything changes with Jess and Jason. Rachel goes to the police, but they call her an unreliable witness. Delving deeper into what happened herself, Rachel begins to suspect she has done more harm than good, and finds herself entangled in the lives of all involved.