They call them Travelers. They move from city to city, sometimes singly, sometimes in couples, panhandling, committing no crimes they just like to stay on the move. And now somebody is killing them. Lucas Davenport's adopted daughter, Letty, is home from her freshman year in college when she gets a phone call. It's a woman she'd befriended in San Francisco, a Traveler, who thinks somebody's killing her friends, she's afraid she knows who it is, and now her male companion, with whom she'd shared her suspicions, has gone missing. She's hiding out now, in Fargo, North Dakota, and she doesn't know what to do. Letty tells Lucas she's going to get her, and, though he suspects Letty's getting played, he volunteers to go with her. When he hears the woman's story, though, he begins to think there's something in it. Little does he know. In the days to come, he will embark upon an odyssey through a subculture unlike any he has ever known a trip that will not only put his life, and Letty's, in danger, but just may change the course of his life forever.