Harriet “Harry” is a rising novelist newly engaged to Edward, a charming man who’s long distanced himself from his wealthy and powerful family, the Holbecks. But when they’re drawn back into the elite circle for the holidays, Harry is captivated by their opulence—until Edward’s enigmatic father, Robert, hands her a cassette tape containing a chilling confession. As Harry tries to uncover the truth behind the Holbecks’ carefully guarded secrets, she must navigate their twisted Christmas rituals and sinister games, realizing too late that stepping into their world may come at a deadly cost.