In 1904, journalist John Stanton, the son of the man who had been Abe Lincoln's secretary of war, seeks to clear his father of being implicated in the death of America's towering sixteenth president.

A trove of incriminating and circumstantial evidence has led a mob of revisionist historians to accuse Secretary Edwin Stanton of being at the heart of the assassination plot.

But John believes he's found the key as to why his father is being smeared: a large, far-reaching conspiracy that ranges forty years. At its epicenter is an enigmatic Englishman, Tom...