The annual Christmas Game is afoot at Endgame House, the Armitages' grand family home. This year's prize is to die for—deeds to the house itself—but Lily Armitage has no intention of returning. She hasn't been back to Endgame since her mother died, twenty-one years ago, and she has no intention of claiming the house that haunts her dreams.

Until, that is, she receives a letter from her aunt promising that the game's riddles will give her the keys not only to Endgame, but to its darkest secrets, including the identity of her mother's murderer.

Now, Lily must compete with her estranged cousins for the twelve days of Christmas. The snow is thick, the phone lines are down, and no one is getting in or out. Lily will have to keep her wits about her, because not everyone is playing fair, and there's no telling how many will die before the winner is declared.