Clyde Barr, the drifter with lethal skills, is alone again, wandering the highways of the American West in search of something to believe in. As summer turns to autumn, he trades his car for a horse and heads for the mountains, planning to clear his head and regain his edge with some hunting. But when he runs across an elderly sick man-- a Ute Indian from a nearby reservation-- Clyde's dream of solitude is quickly dashed. On the reservation, Clyde finds the old man's daughter, Lawana, and grandson, Taylor, as well as a group of menacing bikers called Reapers running wild in the economically depressed, half-abandoned village. Gripped by the desire to do good in a hard world, Clyde offers to stay on Lawana's ranch to help out until her father is released from the hospital. He controls himself around the bikers, even when he sees them harass a few Native American women but when the Reapers attack a local boy Clyde has to do something. As tensions rise between the locals and the Reapers, Clyde's efforts to protect the reservation become a fight for his, Lawana's, and Taylor's lives. And then the stakes ratchet up even more. In the remote Utah desert, surrounded by enemies, with no law enforcement presence, and with communication effectively cut off, Clyde must find a way to save his new friends, defeat the gang, and, hopefully, escape with his own skin intact. A Promise to Kill is an edge-of-the-seat thriller, pushing its no-hold-barred hero to new levels of improvisation and bare-knuckled blunt force.