Pastor turned long-haul trucker, Mack, struggles with grief and perceived failures as a minister while he is confronted with a mysterious hitchhiker, smugglers and a determined killer. After an unbearable tragedy strikes his life, he sells everything he owns and buys a new Peterbilt truck, returning to the trade he learned decades earlier. Hoping for some windshield therapy and peace of mind behind the wheel of his new rig, Mack gets neither after God nudges him to pick up a hitchhiker near the Jordan State Prison outside Mack’s childhood home of Pampa, Texas. The story unfolds as the hitchhiker enters Mack’s Peterbilt. The man reminds Mack of his father, a hard living, hard drinking oilfield roughneck who died in prison. God begins to do a work in Mack’s heart while Mack seeks to minister to his new passenger. But Mack soon rues the day he let the hitchhiker into his truck. His old life in ruins now, Mack learns he has angered a new enemy who threatens to destroy his life on the road as well. Mack suspects he is being followed and is in the sights of a killer who plots a revenge no one could have seen coming.