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.

"After a mysterious accident that closes a portal to another world, magic is banned in Talhaven. But there are those like Rook who are stranded in Talhaven and still have the power to wield magic. Living in exile, a stranger offers Rook and her friend safety, but appearances can be deceiving and the pair soon find themselves in serious danger"-- Provided by publisher.

"Petrel is an outcast on the ancient ship, an icebreaker, that has been following the same course for 300 years. In that time, the ship's crew has forgotten its original purpose and broken into three warring tribes. Everyone has a tribe except Petrel. Nicknamed the Nothing Girl, Petrel has been ostracized ever since her parents were thrown overboard as punishment for a terrible crime. But Petrel is a survivor. She lives in the ship's darkest corners,...

Penguin Pete befriends Horatio, a mouse dwelling on a shipwreck, and finds that he has a lot to learn about life on board a ship.

"When a massive Festival of Ships sails into their town, the Peaches dive into the action, including a search for the missing World's Largest Rubber Duck"-- Provided by publisher.

"Climb aboard the Nautilus with Captain Nemo and embark on an undersea journey around the world in this Jules Verne classic with an arresting new look! When word about sightings of a sea monster spread, three men embark on a journey to find the creature. But when they get thrown overboard, they soon find themselves in the belly of the beast--the underwater vessel named the Nautilus, manned by Captain Nemo. Having discovered his secret submarine, the...

"Berkeley and her best friend, Garth, live on an old cruise ship, scavenging for supplies from the drowned cities left behind on the ocean floor after the sea swallowed up all the land. They think they've seen every kind of aquatic creature, but they never expected to find sea monsters... After awakening a Hydra, Berkeley and Garth are sent to live on a submarine, where they study and hunt sea monsters. But the Hydra wants revenge on their home ship--and...

It is an unusually warm spring and the snow is melting faster than usual. Scientists have come to the North Pole to study the changes. When Lars discovers the submarine, he also discovers two baby polar bears that the scientists have rescued from an ice floe. Lars promises to take the cubs back to their parents. But can he do it?

"Magnus and his friends set sail for the farthest borders of Jotunheim and Niflheim in pursuit of Asgard's greatest threat, Loki's demonic ship full of zombies"--Provided by publisher.

When the world's ships start sinking, secret agent Adam Sharp investigates and discovers metal robot sharks are behind the attacks.