Anna Ballard is plagued by insomnia, night terrors, and overwhelming guilt stemming from a traumatic event. Seeking respite, she accepts a job at the secluded Bay View Hotel on the remote Scottish island of Rum. However, her attempt to escape her past takes a dark turn when seven guests arrive, each harboring secrets. As tensions rise, Anna realizes that one of the guests is lying about their identity and intentions. Trapped in an isolated location with a potential murderer among them, Anna must confront her fears and unravel the mystery before it's too late.