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.

With the help of his friends, Mr. Fish is able to overcome his anger.

As Pete the Cat searches underwater for a seahorse, he comes into contact with all manner of sea creatures.

Octopus leaves her cave in a lively reef because she is shy and the seahorses there find her fascinating, but when she finds a quieter, more peaceful spot she misses her home and friends.

"A small yellow octopus hatches from his egg and begins searching for something he is certain he is missing on an undersea adventure that leads to new friendships along the coast, an exploration of a sunken shipwreck and the discovery of a loving family"--

Encourages young readers to help pout-pout fish find hidden objects in the undersea illustrations.

A giant squid brags about being the best artist in the entire ocean.

A toothy shark attempts to learn the art of sharing with his fellow sea creatures.

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.