Book excerpt: "Each day her father went out to sea to catch fish while Merryn tended her garden. And every night he came home and sang her a lullaby about a mysterious world that lay below the waves--a world of serpents, merrows, monsters, and a sunken city made of gold. Then, one day, everything changed: her father didn't return from the sea. When Merryn dreams that he's in danger, she knows there's only one thing to do: she must dive beneath the waves and save him."--Publisher description.