What is the overall theme of Chasing Lincoln’s Killer?

Chasing Lincoln’s Killer deals with the assassination of Abraham Lincoln and the hunt for his killer. Written by James L. Swanson, the book is not a dry treatment of historical events. Instead, it is a captivating look into the people and places surrounding a tragic event in American history. The reader feels as if he or she is transported to Ford's Theater and the Seward's mansion.
The killer was John Wilkes Booth, a famous, charismatic, and handsome actor. He had long been a sympathizer with the South. As the South's fortunes waned in the last year of the war, he became increasingly angry and frustrated. He gathered a group of co-conspirators, but attempts to kidnap Lincoln failed. By April 1865, Booth had decided to murder Lincoln. By coincidence, Booth learned that Lincoln was scheduled to attend Ford's Theater on the evening of April 14. After mortally wounding Lincoln, Booth made his escape.
There was a massive manhunt for Booth. He and an accomplice, David Herold, fled through fields, over rivers, and across swamps. A reward of $100,000.00 was offered for Booth. The 12-day search for Booth makes for exciting reading. Booth and Herold are finally caught in a barn. Herold surrendered, but Booth was either shot or he shot himself. Herold and three others were executed for their role in the assassination.