Evan and Claire Jones are typical teenagers, forced to hang around their parents at yet another boring museum . . . that is, until something extraordinary happens to make their day a little more interesting. After following a strange, little creature into a closed museum exhibit, Evan and his older sister, Claire, discover a golden band in the shape of a serpent biting its tail. It is the Serpent's Ring, one of the magical relics formed from the shattered Mysticus Orb. Purely by accident, Evan and Claire, have awakened its powers and opened a portal to Sagaas, the land of ancient gods.
Before the siblings can grasp what has happened, the Serpent's Ring is wrenched from Evan’s hand by an enormous flying fish and taken to Aegir, the Norse god of the sea. Furious at mankind for polluting his oceans, Aegir plans on using the ring to unlock Jormundgand's teeth from its tail. If Aegir succeeds, the immense power of the sea will be released and all the lands of Earth will be flooded. Evan and Claire must retrieve the Serpent's Ring and stop him.