It was a glorious time for the two teens, Glenda and Traveler! At home in their magical sanctuary, hidden in downtown Chicago, they immersed themselves in the city's festive winter holiday season. Sadly, their holiday celebrations are cut short. Theo, the sanctuary's protective god, tells them of an approaching great threat. The demigod jinn host is preparing to enter our world. They seek to defeat Theo.The malevolent fire creatures will arrive in the isolated Carpathian Mountains of Transylvania. They chose the fifth century, a chaotic, brutal time. Rampaging Hun armies battle Germanic tribes for control of the vast region. The host uses this turbulence to mask its presence as it plots the ambush of Theo. The teens arrive feeling like unarmed gladiators entering the high-walled arena of the Transylvanian Mountains. Death surrounds them. Armed only with their invisibility skill and their trust in each other, they proceed into the Carpathian abyss.