Ulysses S. Grant's life has typically been misunderstood. He is often caricatured as a chronic loser and an inept businessman, or as the triumphant but brutal Union general of the Civil War. But these stereotypes don't capture the general and president whose fortunes rose and fell with dizzying speed and frequency. Before the Civil War, Grant was flailing. His business ventures had ended dismally, and despite distinguished service in the Mexican War he ended up resigning from the army in disgrace amid recurring accusations of drunkenness. But in war, Grant began to realize his remarkable potential, soaring through the ranks of the Union army, prevailing at the battle of Shiloh and in the Vicksburg campaign, and ultimately defeating the legendary Confederate general Robert E. Lee. Along the way, Grant endeared himself to President Lincoln and became his most trusted general and the strategic genius of the war effort. Grant's military fame translated into a two-term presidency, but one plagued by corruption scandals involving his closest staff members. But during his administration he sought freedom and justice for black Americans, working to crush the Ku Klux Klan and earning the admiration of Frederick Douglass, who called him "the vigilant, firm, impartial, and wise protector of my race." After his presidency, he brought low by a dashing young swindler on Wall Street, only to resuscitate his image by working with Mark Twain to publish his memoirs, which are recognized as a masterpiece of the genre. Ron Chernow finds the threads that bind these disparate stories together, shedding new light on the man whom Walt Whitman described as "nothing heroic ... and yet the greatest hero."