When her brother is KIA two months before Christmas, Ivy Denver is feeling a little Grinchy. Bah Humbug and all that. But a promise is a promise, to a friend's annual Christmas party, she goes. Little does she know, a surprise awaits her under the mistletoe. Suffering from survivor's guilt and PTSD, Jacob Leger heads home to Missoula for the holidays, not looking forward to seeing his late friend's family, especially his friend's little sister. But he has hope things will turn around when a little old lady who looks an awful lot like Mrs. Claus tells him the answer to his problems will be waiting for him under the mistletoe. With that in mind, he heads to the Christmas party that will change his life.