Captain Apache is a Native Americans in the United States U.S. Cavalry officer who finds himself tangled into a Conspiracy (political), and proceeding upon the case of solving the enigma of the last words of a dead Commissioner (and Captain′s old friend) which were: "April morning". Each time he nears discovering the meaning of the phrase, another character capable of providing certain help in solving the mystery dies and throws him off the trail. The journey eventually takes the Captain to a train, one which pulls a private railroad car named "April Morning", transporting President Ulysses S. Grant. Putting the information together leads the Captain to realizing an assassination is about to take place and he is the only one who can prevent it.