The answer is . . . Everworld.

In the dark past, Zeus and Odin, Huitzilopoctli and Ra, and the other gods of myth decided to abandon the real world. They created another universe where magic rules, where all the mystery and terror of these capricious immortals holds sway. It is a place where Vikings still sail in the name of Thor, where the Aztecs still make human sacrifices to Huitzilopoctli, and where Merlin still weaves his subtle webs.

For a thousand years and more EVERWORLD has existed apart from the real world. But now Everworld is in trouble. The cozy universe created by Earth's ancient immortals has been invaded by the creatures of myths that are no part of human tradition. The gods are under attack, divided, terrified. And in this moment of supreme danger, Loki, Norse god of evil, reaches across the barrier between Everworld and the real world to seize a new power: Senna Wales.

Senna carries with her four ordinary high school kids from the Midwest. David, the insecure hero and Senna's love; Christopher, the joker Senna spurned, who hides his own anger and bigotry beneath a glib veneer; Jalil, cold, calculating and so devoted to rationality he can't even acknowledge his own strange tie to Senna; and April, Senna's half-sister — actress, flirt, and Senna's most dangerous enemy.