Emily is having the time of her life in the Chilean highlands with her closest friend, Kristen, on their yearly reunion vacation, and the two ladies are closer than ever. However, Emily finds blood and shattered glass on the floor of their hotel room on the final night of their vacation. Kristen claims she was assaulted by the attractive backpacker she had been flirting with, and she had no option but to murder him in self-defense. Even more shocking: the picture seems very identical to the one from last year's trip, when another traveler died. Emily can't believe it's happened once again—does lightning strike twice?

Emily tries to conceal her pain back home in Wisconsin, immersing herself into a new romance and job. However, Emily is forced to face their violent history when Kristen pays them an unexpected visit. Emily begins to doubt Kristen's intentions as she attempts to keep Emily close. Emily must confront the truth about her best friend as the walls closing in on their cover-ups shut in on them. Is she able to escape the secrets she shares with Kristen, or will they ruin her relationship, her independence, and perhaps her life?