관광객들을 상대로 레저 투어업을 하는 ‘데이비드’(게리 올드만)과 ‘사라’(에밀리 모티머) 부부는 무언가에 홀린 듯 딸의 이름과 같은 '메리'라는 이름의 배 한 척을 사게 된다. 설레는 마음을 안은 채 두 딸과 선원 마이크, 토미를 태워 항해에 나서고... ‘메리 호’에 승선한 이들은 점점 기묘한 말과 행동을 하기 시작하고, 메리 호에 얽힌 숨겨진 진실들이 점차 드러나면서 이 가족의 목숨을 위협하는 정체와 맞닥뜨리게 되는데… “이 배에 다른 사람이 있는 것 같아!”
Sam, a soldier who had served in Afghanistan and Iraq, meets Amira when he visits her uncle, Bassam, who had served as Sam's Iraqi translator. Bassam and Sam have a special bond due to their time together in the war. Initially Amira does not trust him because he was an American soldier and her brother was killed by a bomb from American troops in the war. Sam's cousin, Charlie, asks Sam to help him with illegal hedge funds unbeknownst to Sam at the time. Amira is staying with her uncle Bassam since her father died. She sells bootlegged films on the street corner but is forced to stay with Sam after getting busted; immigration officials begin pursuing her. As the film progresses, Sam and Amira fall in love.
