During the presidency of Ulysses S. Grant, the full-blooded Native American US Army Cavalry officer, , finds himself entangled in a well-planned conspiracy, while on a mission to investigate the death of the Indian Commissioner, Harry Collier. With his sole clue being the victim's cryptic dying words, "April Morning", will soon cross paths with the tough arms-runner, Griffin, as everyone around him who knows something about the puzzling case, eventually, ends up murdered. Is there an intricate plot and an even greater scheme of corruption behind those hideous killings? As the bullets start flying, the inquisitive Captain will shortly find out how deep the conspiracy goes.