Sweet, awkward sixteen-year-old Ruby Gillman is desperate to fit in at Oceanside High, but she mostly just feels invisible. She's math-tutoring her skater-boy crush, who only seems to admire her for her fractals, and she's prevented from hanging out with the cool kids at the beach because her over-protective supermom, has forbade Ruby from ever getting in the water. But when she breaks her mom's #1 rule, Ruby will discover that she is a direct descendant...

Lucas and Clara are floating on a raft when a wave casts them into the sea, where Lucas catches a glimpse of a coral kindom and a dark-haired mermaid helps him, but when his father, King Caleb, hears of this, he scolds Lucas and tells him he has broken an age-old pact.

When three normal teenage girls stumble upon an ancient cavern they undergo a transformation that will change their lives forever. H20 - just add water, sees three very different girls facing everyday teen problems with a twist - they're mermaids with incredible powers over water.

Of all the creatures in the ocean, sea horses are Echo Reef's favorite. They're sweet and gentle and they glide through the water so gracefully. When Echo discovers that Rocky Ridge, one of her Trident Academy classmates, has his own pet sea horse, she wants one right away. Not everyone agrees sea horses should be pets, however. Perhaps they are happiest when swimming freely. But Echo thinks that if Rocky can make a sea horse happy, she can too!...

Misty and five fellow mermaids, on a quest to retrieve six magic crystals that will protect the Coral Kingdom for the next year, face a storm sent by the evil Mantora and are driven off-course to the Kelp Forest, where they find a different kind of trouble.

When Pinkalicious and Peter go to the hidden cove to meet their friend Aqua, a mini-mermaid, they see pirates instead.

Eleven-year-old Mary Margaret takes a cruise through the Greek Isles with her recently widowed grandmother and keeps a journal of her adventures.

Mermaid princess Lily is about to renounce her place in the royal succession of the undersea kingdom of Thalassina and spend her life on land with the boy she loves, until her annoying cousin appears and throws her decision into doubt.

"Shy Dylan arrives at a summer arts camp and immediately connects with flamboyant Coral. They bond over the aquatic theme of the camp and a drive to create comic books. The two girls plan a comic book about lifeguards who are transformed into mermaids and fight for eco-justice in the sea. At first Dylan wishes she could be more outgoing, like Coral. But Coral's tendency to appear loud and foolish pushes Dylan back behind the scenes, where she has...

Blood calls to blood; charm calls to charm. It is the way of the world. Come close and tell us your dreams. Sanna is a mermaid -- but she is only half seavish. The night of her birth, a sea-witch cast a spell that made Sanna's people, including her landish mother, forget how and where she was born. Now Sanna is sixteen and an outsider in the seavish matriarchy, and she is determined to find her mother and learn who she is. She apprentices herself...