Their magic tree house takes Jack and Annie deep into the sea, where they meet up with dolphins, sharks, and octopi as they search for the answer to an ancient riddle.

On Mermaid Day, the mer-queen throws a big bash and sea creatures of all kinds attend, including a shy shark who joins in the dancing.

Danny Dragonbreath and his friend Wendell get an up-close underwater tour of the Sargasso Sea from Danny's sea-serpent cousin, encountering giant squid and mako sharks--and learn about standing up to bullies in the process.

Absorbed in his search for food, a shy hermit crab, disguised in a fancy new shell, inadvertently rescues a flounder caught beneath a trap and wins the admiration of the other marine animals.

Helps the reader to explore rock pools, coral reefs and shipwrecks plus to meet the fascinating creatures that live in the world's oceans and seas.

The pout-pout fish believes he only knows how to frown, even though many of his friends suggest ways to change his expression, until one day a fish comes along that shows him otherwise.

Otter visits the aquarium with Teddy, where she makes new sea friends and learns about many of the amazing animals that live in the ocean.

"Fish Girl, a young mermaid living in a boardwalk aquarium, has never interacted with anyone beyond the walls of her tank until a chance encounter with an ordinary girl, Livia. Their growing friendship inspires Fish Girl's longing for freedom, independence, and a life beyond the aquarium tank"--

Nipper the crab hates his huge, clumsy claws until his friend Octopus gets tangled up in some seaweed and only Nipper can free him.

Clara and Clem are off on an adventure under the sea, where they swim with dolphins, hug a shark, and even find buried treasure.