Father John O'Malley comes across the corpse lying in a ditch beside the highway. When he returns with the police, it is gone. The Arapahos of the Wind River Reservation speak of Ghost Walkers-tormented souls caught between the earth and the spirit world, who are capable of anything.Then, within days, a young man disappears from the Reservation without a trace. A young woman is found brutally murdered. And as Father John and Arapaho lawyer Vicky Holden investigate these crimes, someone-or something-begins following them.Together, Vicky and Father John must draw upon ancient Arapaho traditions to stop a killer, explain the inexplicable, and put a ghost to rest...