In HERO DOG: THE JOURNEY HOME, Royce (Steve Byers), a blind man, is commuting on a boat to see his family after working all week at his new job in the city. He's accompanied by Chinook, an Alaskan Malamute. While crossing the lake, the captain of the boat collapses and falls unconscious, and while the boat doesn't capsize in the lake or crash into the rocks near the shore, Royce is on an isolated part of the lake with no one but Chinook to help him get back. While his two kids, Max and Erin, wait for Royce at the dock with their Aunt Susan (Natasha Henstridge). (Their mother died of cancer two years earlier.) Susan begins to fear the worst, and the search for Royce soon begins, first on the lake and then through the thick forest around the lake.
As the search continues and Royce remains missing, Max and Erin decide to sneak out and use their camping skills to conduct a search of their own, but they soon become lost themselves. Meanwhile, Royce, with the help of Chinook, must cross rough waters, navigate dangerous crossings, and face off against a mountain lion. Nonetheless, Chinook proves to be a brave companion to Royce, with a rather extraordinary gift for orienteering. But when Royce sustains finds himself trapped beneath a log and unable to move, it's going to require the help of Chinook, Royce's kids, and the entire search party to somehow find Royce and get him and Chinook back home.