An Enemy of Peace by Robert Silverberg

In a war-torn America, Center City stands as a beacon of hope under the leadership of Lloyd Riddell. But when the neighboring town of Northburg, led by the power-hungry David Barr, threatens to conquer Center City, Riddell must find a way to stop the impending war without resorting to bloodshed. As tensions rise and spies infiltrate both cities, Riddell embarks on a dangerous mission to confront Barr and save his beloved town.