Two Exes. One holiday adventure. Merry Ex-Mas? Seventeen-year-old Lila Beckwith's parents just left for vacation, and Lila's all set to throw the holiday party of the season. But when her Christmas-obsessed little brother, Cooper, discovers that global warming is melting the North Pole, he and his best friend, Tyler, take off on a runaway mission to save Santa. Lila has to get Cooper safely home before her parents get back on Christmas Eve. But the only person who can help her is Tyler's older brother, Beau — a.k.a. Lila's musician, anti-everything ex-boyfriend. It'll take more than a Christmas miracle for Lila and Beau to overcome their differences and find their fugitive brothers. But could a journey destined for disaster help these polar opposites fall in love...all over again?