Deputy US Marshal Jed Colter captures the dangerous half-breed, Charlie Bearsfoot, who's accused of murder. Colter ferrets out the facts, clearing Bearsfoot, which leads to an improbable alliance betweem them. Colter learns of presidential nominee General Ulysses S. Grant's impending visit to Laramie. A plot to assassinate Grant is real. Colter's challenge? Find out who is behind it and stop them. Colter enlists the help of Bearsfoot, a walking arsenal, and ex-sheriff Luke Radison, a good man to have around when trouble visits. They tenaciously pursue every lead: a body with no identification and a missing horse, a man posing as a US Marshal, and the enigmatic, battle-scarred Henry Jackson, who haunts the thoughts of Colter and his betrothed, Ellen Wellsley. Finding the dead man's horse may be the answer to their quandary, but time is running out.