On April 22, 1865, Brevet Colonel H. L. Burnett was assigned to head the investigation into the murder of President Abraham Lincoln and the attempted murder of Secretary of State William H. Seward. Burnett orchestrated the collection of thousands of documents for the Military Commission s trial of the conspirators. This deep archive of documentary evidence--consisting of letters, depositions, eyewitness accounts, investigative reports, and other documents--provides invaluable insight into the historical, cultural, and judicial context of the investigation. Only a fraction of the...