The movie trailer for The Girl on the Train is finally here! The dark, twisted novel tells the story of Rachel Watson, an unreliable, alcoholic divorcée who becomes obsessed with a husband and wife she glimpses from the window of the commuter train she takes to work every day — and later gets involved with the investigation of the wife's disappearance. The bestseller is being brought to life on the silver screen with Emily Blunt in the leading role, and it looks like it's going to be every bit as thrilling and suspenseful as we all hoped. Is Rachel crazy? Is she a murderer? Watch the trailer above, and check out Blunt and costar Justin Theroux in action in some photos from the set.