Ten-year-old Gloria and her recently widowed grandfather Bud befriend a mysterious reindeer when the family gather for Christmas. Bud comes to believe that Prancer may actually be magical, but Gloria fears his theory will send him straight to a retirement home.
A call to a quiet suburban home unleashes unthinkable carnage when two officers mistakenly shoot a man and his infant child, spiraling the tragedy into a fierce, unrelenting fall into the unknown.