Bus tours that follow the route of Lincoln assassin John Wilkes Booth do not offer answers. “‘It’s the kind of story that is very difficult for historians,’ says Elizabeth Leonard, John J. and Cornelia C. Gibson Professor of History at Maine’s Colby College and author of ‘Lincoln’s Avengers: Justice, Revenge, and Reunion After the Civil War.’ ‘There’s a lot to sort through, and there is a lot you can’t figure out, but there’s just enough bait to keep a lot of people interested.'”