Claire and Matt are no longer together but decide that it would be best for their daughter, Scarlett, to have a "normal" family Christmas. Claire brings her new boyfriend, Patrick (never Pat), a seemingly sensible, eligible from a distance Ironman in Waiting. Matt brings the new love of his life, Alex, funny, smart, and extremely patient. Scarlett, who is seven, brings her imaginary friend Posey. He's a giant rabbit. Together the five (or six?) of them grit their teeth over Forced Fun Activities, drink a little too much after Scarlett's bedtime, overshare classified secrets about their pasts . . . and before you know it, their holiday is a powder keg that ends where this novel begins—with a tearful, frightened call to the police.