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.

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.