Sarah (Skye Bennett) is an autistic little girl who is currently living at 'St. Mary's Hospital'. Her father (Ben) (Noah Huntley), concerned about the state of the hospital, finally decides to take his daughter home as a scanner catches fire with Sarah within it. They board an elevator with a group of strangers, including a businessman (Jonathan "Jon") (William Hope), a nurse (Emily) (Dominique McElligott), a tramp (Tobias) (Ronald Pickup), and a security guard (Rick) (Leon Herbert), but when the elevator reaches the next floor down, the hospital is abandoned. It soon becomes clear the safety of the group rests upon Sarah
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