It's 1780, days after Benedict Arnold flees to the British when his treasonous plot to surrender the American fort at West Point is discovered and Gideon's Revolution is about to begin. General George Washington orders a secret mission for two Continental Army soldiers to go behind enemy lines, abduct Arnold, and return him to his countrymen to be tried and hanged.

Washington selects one of the soldiers, Gideon Wheatley, for the mission because Arnold would trust him. Wheatley fought under Arnold's command at Saratoga and tended to the gravely wounded general for several months at Albany's military hospital. After feigning desertion to the British Army to join Arnold's corps of loyalists, Wheatley and his comrade John Champe seek out Washington's spies in New York and develop a plan to seize the traitor. But when the abduction is foiled, the soldiers are trapped by their own deceit and forced to fight alongside Arnold's raiding army, as if they were traitors themselves.

Years after the war, pressed by memories that haunt him and seeking redemption, Wheatley must decide whether he alone can exact revenge on his former friend and commander, a decision that sends him across the Atlantic to London, to find and confront Arnold.