It is two days before Christmas Eve, and the park is quiet under fresh snow - until Jake and Scout find a young reindeer hiding under the pine tree, his red harness all tangled up.
The reindeer is cold, frightened, and far from home. With Milo and Ben beside them, Jake and Scout follow the clues: a little brass sleigh bell with a tiny star, hoofprints in the snow, and a torn piece of red ribbon. Bit by bit, they work out the truth - this is Comet, a young reindeer from a sleigh team, separated from his friends during a practice flight. Now the clock is ticking. Jake and his friends keep Comet warm and fed, fix his harness, and light a row of lanterns to guide his team back to the hill. A gentle Christmas mystery about kindness, teamwork, and getting a friend home in time for Christmas Eve.