In his 300th adventure, Skye Fargo is headed east, where he's been hired by a group of Illinois citizens to stop the murderous "Sagamon River Monster." For years, entire families have been slaughtered without mercy, and none who pursue the Monster are ever heard from again. But as he gets closer to his quarry, the Trailsman realizes that he's being set up to take the fall in a diabolical scheme of political assassination and simmering hatred that could cost him his life--and tear the nation apart.