In this second story of The Green Horse Trilogy, King Nicholas, summons the magic horses to battle the evil sorceress Sheraptu who has summoned an army of demons, led by their fierce leader Draco. The Sorceress has caused a black cloud to appear over her Black Mountain lair and demons led by Draco are flying down from the cloud and turning people to stone. In order to defeat them all, King Nicholas must figure out how, while working with the magic colored horses to save the kingdom as well as their lives.