The Christmas Secret (2000)

Not to be confused with the 2014 movie with the same title which is a Hallmark Movies & Mysteries original movie based on the "Christmas Hope" novels by Donna Vanliere. This TV movie is partially based on the 1996 children's book "Flight of the Reindeer: The True Story of Santa Claus and His Christmas Mission" by Robert Sullivan, and was first broadcast on the CBS network in 2000.