In the aftermath of the September 1862 Battle of Antietam, President Abraham Lincoln issued the most significant presidential decree in American history, the Emancipation Proclamation, which would forever free all slaves in territory not under Union control. Nevertheless, his chief military commander in the field, Major General George B. McClellan, was outraged. Within days, two former Union officers nefariously crossed the lines into rebeldom, an initiative resulting in an elaborate subterfuge to scam Lincoln into withdrawing the Proclamation in return for nebulous promises of peace.

This book tells the story, obscured in a veil of secrecy for 150 years, of the cloak and dagger chess match between Union detectives and Southern operatives in the months before emancipation become effective. Despite an ominous warning by author Herman Melville five years before, the scheme to perpetuate slavery almost succeeded, for it was engineered by a man the National Police Gazette once declared the "King of the Confidence Men."