Winter 1861: the United States teeters on the brink of civil war. In Washington, D.C., Colonel Charles P. Rook is tapped to organize the district’s security and to protect president-elect Abraham Lincoln from the death threats pouring in to the White House. He surrounds the president with bodyguards and fills the city’s rooftops with sharpshooters, diligently investigating the conspiracies being fomented with increasing intensity by Southern secessionists. Yet amidst the chaos and confusion, a foreigner slips unnoticed into the teeming city. Hired by a wealthy Southern planter to eliminate President Lincoln and destroy the Union once and for all, the assassin catches Rook’s attention by cutting down anyone who gets in his way.