Elizabeth Allen is spoilt and selfish. When she's sent away to boarding school she makes up her mind to be the naughtiest pupil there's ever been! But Elizabeth soon finds out that being bad isn't as simple as it seems.
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...