It's been four years since Steve and Sarah Miller discovered the magical portal to the kingdom of Lentari and took on the role of guardians to the crown prince, Mikal. The now-teenaged prince is adapting well to life in modern-day America, but their peaceful existence is rocked to the core when they are attacked by creatures not of this world, during a vacation trip. And when a second attack happens, they know they must return to Lentari and find out how someone from there has crossed into their world to endanger their lives.

Crossing back through the portal, they discover trouble: dragon raids are on the rise; the dwarves are preparing to go to war; and an evil sorceress, Celestia, is the one who has managed to reach across time and space to attack Mikal on his protector's home world. Steve and Sarah's only hope to save Mikal from Celestia and her minions lies with the recovery of a piece of an ancient talisman, the Amulet of Aria, believed lost centuries ago. Having the ability to enhance the holder's jhorun—their magical talent—to unheard of levels, the amulet pieces must be found before Celestia gains control of the most powerful magic in the kingdom and of Mikal himself.