Conspiracy tells the story of the final pursuit of the Dakota by Minnesota soldiers into the Dakota Territory following the U.S. Dakota War of 1862. It follows the experiences of Jesse Buchanen as he is called from the frontier to report to Washington, D.C., to become one of President Lincoln's guards. Jesse discovers a wide conspiracy that threatens Lincoln and the preservation of the Union. He also uncovers a dark secret that could destroy the government if it is revealed.