In 1868 Congress impeached President Andrew Johnson of Tennessee, the man who had succeeded the murdered Lincoln, bringing the nation to the brink of a second civil war. Enraged to see the freed slaves abandoned to brutal violence at the hands of their former owners, distraught that former rebels threatened to regain control of Southern state governments, and disgusted by Johnson's brawling political style, congressional Republicans seized on a legal technicality as the basis for impeachment - whether Johnson had the legal right to fire his own secretary of war, Edwin Stanton.

The Senate trial featured the most brilliant lawyers of the day, along with some of the least scrupulous, while leading political fixers maneuvered in dark corners to save Johnson's presidency with political deals, promises of patronage jobs, and even cash bribes. Johnson escaped conviction by a single vote.

David Stewart, the author of the highly acclaimed The Summer of 1787, challenges the traditional version of this pivotal moment in American history. Rather than seeing Johnson as Abraham Lincoln's political heir, Stewart explains how the Tennessean squandered Lincoln's political legacy of equality and fairness and helped force the freed slaves into a brutal form of agricultural peonage across the South.