Anxious to solve the mystery of whether his mother is still alive, and keen to follow his uncle's dying wish, Lupus and his friends sail to the island of Rhodes, site of one of the seven wonders of the ancient world - and base of a criminal mastermind!
The magic ring that Emily Windsnap - half mermaid, half ordinary girl - finds buried in the sand belongs to Neptune, and he wants it back. But the ring, once on, won't come off, and an angry Neptun...