Alice Loudon (Heather Graham) lives a comfortable, predictable life in London with her dependable boyfriend, Jake (Ulrich Danish/Thomsen). Her world is turned upside down by a chance encounter on the street with Adam Tallis (Joseph Fiennes), a mysterious and intense celebrity mountaineer. Instantly consumed by an overwhelming physical obsession, Alice abruptly abandons Jake to marry Adam after a whirlwind courtship. However, as Alice settles into married life, she begins receiving mysterious warning notes and discovers disturbing secrets about Adam's past—including the unexplained disappearance of his former lovers—leading her to question whether her intense passion has put her life in danger.