From his election in November 1860 to his death in April 1865, Abraham Lincoln faced constant danger from those hostile to him and to the Union cause. Lincoln’s enemies made four overt attempts on his life, including a Confederate partisan effort to infect him with yellow fever by sending a contaminated valise of clothing to the White House. Because Lincoln’s life ended with John Wilkes Booth’s assassination plot, the president’s protection has come under extreme scrutiny, with many considering it flawed, inadequate, or completely lacking. By providing the first thorough exploration of the security surrounding Lincoln, this intriguing study offers new insight into this long-running issue. Detailing the dangers, real and uncertain, facing Lincoln and the unprecedented measures taken to protect his life and health, this work presents a fresh perspective on the presidency of the Great Emancipator.