SYNOPSIS (with spoilers)
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On the second night of HALEY and STEFFEN’S secluded mountain honeymoon, BOBBY knocks on their door and claims to be a lost camper. Bobby knocks Steffen unconscious, and ties him up in the basement. Bobby tells Haley that Steffen’s name is really Liam, a man he suspects murdered his sister on her honeymoon five years earlier. Steffen admits the previous marriage, but denies involvement in the sister’s death.
Believing Steffen, Haley helps undo his bindings, and when Bobby comes to check on them, Steffen attacks Bobby. In the scuffle, Bobby’s gun discharges, hitting Haley in the arm. In this midpoint reversal, Steffen ties up Bobby in the basement and administers first aid to Haley. Steffen explains Bobby’s sister died of accidental drowning after a nerve-debilitating jellyfish sting. Haley remains skeptical of Steffen’s explanation.
Bobby later reveals that Steffen (Liam) met his sister the exact same (odd) way as Haley. As Haley absorbs this information, Steffen comes into the basement and Bobby, who has spent hours loosening his bindings, attacks him. They wrestle for control of Bobby’s handgun. Steffen wins that battle, but Haley knocks Steffen out before he can shoot Bobby.
Haley ties up both men, locks them in the basement and heads toward a nearby fire tower to radio for help. Bobby gets free, follows her there, after possibly killing Steffen, and later attacks Haley (the only witness to his crime) upon her return to the cabin. Bobby and Haley fight, and when Bobby gets the upper hand, a badly-injured Steffen appears and shoots Bobby, killing him. One year later, as Haley and Steffen head off on Honeymoon 2.0, we see that Steffen may, in fact, be planning to murder Haley after all.