Every Christmas, Reilly Shore picks a random spot on the map and takes a trip. This year, that destination is the cottage country town of Mistletoe Lake. When she arrives, she discovers the town's lone B&B is chock-full due to Mistletoe Lake's annual Christmas Harbor Festival when all the boats docked along the water are decorated with festive lights.
When twelve-year-old Emma invites Reilly to stay on her dad's boat, she learns that Emma's dad, Ray Mitchell, is the only boat owner on Mistletoe Lake who isn't participating in the harbor festival. In fact, he's in the process of trying to sell the boat. As the possibility of the sale saddens Emma, she enlists Reilly's help to convince Ray to enter the festival so they can have one last perfect Christmas on the picturesque lake.

Reilly doesn't know she's about to meet someone who is as romantically adrift as she is. And she certainly doesn't expect to fall in love...or to unintentionally betray him. Christmas is a time for forgiveness, but Ray doesn't seem to be in a forgiving mood.