It is the day after Christmas and Christmastown highway is jammed with elves coming back to the North Pole after their day off, so when one of the sleighs falls through a crack in the highway ice, one of the South Police, who are penguins, comes to the rescue.

Sophie is settling in nicely to her new life in Havenfield. She's getting to spend time with rare, precious species-- including the first female Alicorn. Sophie is tasked with helping to train the magical creature so that the Alicorn can be revealed to the people of the lost cities as a sign of hope. But the secrets buried deep in Sophie's memories remain, and before long she's back in incredible danger, risking everything to find the answers to questions...