Finn and Weston finally reach the island of the Lady of the Lake, a powerful being who can send them to the moon—but at what cost? The brothers strike a dangerous bargain that could trap them on the Dark Side forever. Their journey takes them through a magical lake portal to the moon's surface, where they discover an entrance leading to the moon's core. As they descend into the lunar depths, five ferocious manticores emerge from mysterious pools, surrounding the brothers in an epic battle for survival.