Immediately after the successful conclusion of his last case, Lightning Jim received two letters. One was from Bill Turner, a cattle rancher and old friend of Jim's, who had been shot by an unknown assailant and who had written from his deathbed. He asked Jim to come to the cattle town of Broken Horn, to help his son Jack clean up a rustling gang operating around there. The other letter was from the mayor of Broken Horn, asking Jim to come for town for the same reason...