The Secret of the Swamp King is the second book in the Wilderking Trilogy, a middle-grade fantasy adventure series inspired by the biblical story of King David, set in a world resembling the frontier of the American South.

A vindictive King Darrow sends Aidan Errolson on a seemingly impossible quest into the depths of the Feechiefen Swamp. There, Aidan must face a foe who threatens all of Corenwald.