Emily is in the mountains of Chile with her best friend, Kristen, on their annual reunion trip. But on the last night of the trip, Emily enters their hotel suite to find blood and broken glass on the floor. Kristen says the cute backpacker she brought back to the room attacked her, and she had no choice but to kill him in self-defense. Even more shocking: The scene is horrifyingly similar to last year's trip, when another backpacker wound up dead ... A Reese Witherspoon Bookclub Pick.