Supernatural: Witch's Canyon 2007 Novel

Author: Jeff Mariotte Twenty-two years ago, Sam and Dean Winchester lost their mother to a demonic supernatural force, and they have grown up learning how to hunt and kill paranormal evil. Now they are on a road trip around the Grand Canyon - to a stretch of deserted ranchland where mysterious murder sprees occur every forty years. But a new mega-mall is about to open and the brothers must face a horde of vindictive ghosts and animal spirits.