Bullets. Blood. And a conspiracy unravels . . . It all began with stolen mail from the old Pony Express, but that was just the tip of the iceberg. The missing package shed light on a conspiracy hatched in the decade before the Civil War that led to the assassination of Abraham Lincoln. But the plotting didn't stop there. Confederate leadership in exile has coordinated an effort to take portions of Texas by force and resurrect the Confederacy by assassinating President Chester Arthur. At every stage of the plot, Kit Sloan and Jack Hardesty have ridden hard, prepared to sacrifice all in a bid to stop Umbrella and the Circle. Now the final act dawns. A presidential visit, a shadowy assassin and a murder plot set to literally blow the roof sky high. With the clock ticking, Sloan and Hardesty ride the final desperate mile to stop the assassin and finish the conspiracy for good.