The Everworld novels introduce mythologies, and in the process, Applegate creates a new mythology of her own, in which human endeavors are placed in a vast cosmic scheme in which everyone is important, even though in any individual novel they may seem like pawns. Search for Senna introduces Vikings, Loki, and Norse mythology. Realm of the Reaper delves more deeply into Norse myths about life and death and the underworld. Land of Loss focuses more on Aztec mythology than Norse mythology and introduces the Coo-Hatch, aliens from yet another world. Enter the Enchanted tells of the survival of Arthurian culture in Everworld and shows how the various cultures and their gods know about each other and mix with each other. This helps explain the intrusion of leprechauns into Nidhoggr's den, even though the leprechauns come from Irish folklore while Nidhoggr comes from Norse mythology.

Once the...