On Christmas Eve, Percy stumbles upon a child’s letter to Santa Claus that was overlooked in his mail van. Determined to set things right, he embarks on a mission to find Santa himself. With the assistance of Thomas and his friends, Percy journeys through vibrant parades, the delightful aroma of gingerbread baking, and swirling snowflakes, all in an effort to deliver the letter to Santa and fulfill a child’s Christmas wish.