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The Girl on the Train
336 pages; Riverhead Books
The Premise: Riding the train into London every morning, alcoholic Rachel—whose husband left her for another woman—gets a daily glimpse of a couple who appear to have the perfect life. But one morning, Rachel spots the woman kissing another man; and, not long after that, the woman disappears. Rachel goes to the police, but isn't taken seriously. Then she begins to doubt herself...

Why the Ending Is a Stunner: If you still don't know what happens, we won't wreck it#8212;but boy, are you in for a shock. Between this and Gone Girl, we’ve all begun to rely on unreliable narrators for our fictional thrills.
— Dawn Raffel