A recent divorc?e (Emily Blunt) fantasizes about a couple (Luke Evans and Haley Bennett) whose house she passes each day on her commuter train ride. Soon, she becomes entangled in a mystery involving not only the couple, but her former husband (Justin Theroux) and his new family. Rebecca Ferguson co-stars. Tate Taylor directed this psychological thriller, which was adapted from the 2015 best-selling novel by Paula Hawkins.