Thirteen-year-old Arthur Curry has enough troubles to sink a ship. His mom left him and his dad when Arthur was only three years old. He doesn't fit in with the other students at school. To them, he's just “fish boy,” a weird, freaky kid. But Arthur has a secret. Something so secret, even he doesn't know what it is.
With the help of his only friend, Claudia, Arthur will begin to learn the truth about his mother, himself, and a legendary world that may actually exist.
Oh, and he learns about octopuses. Octopi. It's probably octopi, right?