An imaginative youngster comes across an amnesiac prince, who she believes is a fairy-tale figure. Convinced the man would be perfect for her widowed mom, she launches a plan to set the two up, starting by tricking her mom into hiring him as the new nanny.

When four generations of the Cooper clan come together for their annual Christmas Eve celebration, a series of unexpected visitors and unlikely events turn the night upside down, leading them all toward a surprising rediscovery of family bonds and the spirit of the holiday.