In the wake of a painful breakup with her unfaithful fiance, actress Sloane Tierney seeks refuge in an ancient castle far from the public eye. Liar's Keep is an isolated place on a tiny Scottish island, where Sloane finds an enigmatic man dressed in 18th century clothes, pretending to be the ghost of a long-dead earl. As she is drawn into the mystery of Tristan Hayward's tragic life and death, she discovers that he may be what he seems, and that Liar's Keep holds dangers that could cost Sloane her life—or the love of a lifetime.