When Kendra and Seth go to stay at their grandparents' estate, they discover that it is a sanctuary for magical creatures and that a battle between good and evil is looming.

Since ancient times, the great demon prison Zzyzx has protected the world from the most dangerous servants of darkness, including Gorgrog, the Demon King. After centuries of plotting, the Sphinx is on the verge of recovering the five artifacts necessary to open the legendary prison. To thwart the Sphinx's designs and find a safe home for the five artifacts, Kendra, Seth, and the Knights of the Dawn must venture far beyond the walls of Fablehaven in...