Mission of the Kings, the fourth and final book of the thrilling Overlords saga, finds our hero Harrison Cross and his friends charging to Arcadia's aid, their first step in reuniting humanity, after a brutally coordinated Scynthian surprise attack. Unbeknownst to them, the evil King Holleris and his wicked warlock have created a diabolical race of two-headed dragons to instill fear and terror to all peoples of the land. Harrison, forced to forge unlikely alliances with the land's other humanoid races, prepares to confront the evil king before his heinous army of dragons destroys all that is good. With the odds stacked heavily against them, Harrison must decipher the clues contained in the Talisman of Unification to have any chance of defeating the evil that permeates the land. The question is, can he do it before all is lost?