One hot July afternoon, Joe Scott, a scout at Fort Two Miles, rides his way toward Rainbow Canyon. He carries money for military salaries with him. At the entrance to the canyon, he is intercepted by the well-informed gang "Red Hands", which is known for leaving a bloody palm print during each robbery. Joe falls hit with two bullets. The bandits take the money, and by chance, it is at this point that Tex encounters. Fearing further trouble, the bandits flee, and Tex comes to scout Scott and finds that he is still alive. Before Scott's death, Joe Scott manages to tell Tex the names of the three "Red Hands" bandits. Just then, a military patrol arrives. Tex well assumed that these soldiers would unjustly accuse him of murder. He mounted his faithful horse Dynamite and fled.
Tex runs into a massacre carried out by the El Diablo gang, and swears to the tortured man he finds, to save his daughter. The searches will also make him run into the law, and more precisely in the Secret Service . After a decided start as an outlaw, Tex, while retaining his characteristics, begins the slow march towards a less hasty justice. History within history, the meeting with Bill Mohican , responsible for the death of Florecita , the daughter of El Diablo.
Tex's first Mexican adventure, and the first hint of possible secret Mexican invasion projects.
Tex joins the Rangers' Secret Service with star n.3. The first two are Arkansas Joe and Kit Carson whom Tex gets to know in this story.
