Adaptation of the book by Terry Kay. Robert Samuel (""Mr. Sam"") Peek, a sagacious and seasoned pecan tree grower from rural Georgia, has been married for the last 57 years or so to his college sweetheart, Cora. When she suddenly passes away, Sam becomes increasingly lonelyâ€”until he befriends a snow-white dog that strays onto the Peek property. People wonder if the animal is real or merely a figment of Mr. Sam's imagination. Then Mr. Sam and the dog take a fateful journey to a college reunion.