You're spending the summer at a seaside boardinghouse. One moonlit night you hear someone crying on the beach. You peek out your window—and see a mermaid named Tana. You'd like to help her, but she's in a terrible mood. "I don't know where the rest of the mermaids are," she snaps. "I've been looking for two days, but I can't find any of them. And if you want to hear any more, you'll have to follow me underwater!"

If you go underwater with Tana, turn to page 36. If you lose your temper and go back to bed, turn to page 4. Whichever you choose, watch out! You've already been seen with Tana, and the two of you face danger. You could wind up as an aquarium exhibit, spin to your death in a whirlpool, or be boiled alive by a sea witch. Or you could discover an island paradise and live there happily ever after!

What happens next in the story? It all depends on the choices you make. How does the story end? Only you can find out! And the best part is that you can keep reading and rereading until you've had not one but many incredibly daring experiences!