Fargo Reilly arrives in the town of Verdad de Soleil just as the local rancher, Lucas Carter, looks set to tighten his stranglehold. Reilly seems like a harmless drifter, but after demonstrating his skill with a Colt on Carter's son and thrashing the hulking ranch foreman, things begin to change. In truth, Reilly is a federal marshal. Events take a tangled course and Reilly must use some double dealing and chicanery. Only then can he silence Carter and the Guns on the Wahoo.