As they search for their missing father near their Cornwall home, Sapphy and her brother Conor learn about their family's connection to the domains of air and of water.

Oona and her best friend Otto love to search for treasure...and often find trouble instead. Messy trouble. Tricky trouble. Even shark-related trouble. That's never stopped them before, though! After all, no proper treasure hunt is without some adventure. But when the grandest treasure yet is stuck in a deep, dark rift, Oona's not sure if she can dive right in. What might be waiting for her in those unknown waters?

"Ariel is a mermaid who longs for adventure and to explore the human world! After making a deal with the sea witch, Ursula, will Ariel be able to find her voice?"--

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! Can't...

Four children set out to capture a mermaid, but she manages to escape all of their traps.

As Kurt and Tristan battle for the Sea King's throne, sea witch Nieve kidnaps Layla and raises an army of mutant sea crature to overthrow the crown.

Bottoming out after a dramatic breakup, doctoral student Lucy accepts her sister's invitation to dog-sit at her home on Venice Beach for the summer, where she meets an eerily attractive swimmer whose Sirenic identity transforms her understanding of what real love looks like.

When her mother's reappearance in the Syrena world turns the two kingdoms -- Poseidon and Triton -- against one another, Emma must risk everything she loves and reveal herself -- and her Gift -- to save a people she's never known.

Kai, a merboy, loves to share hugs with his mother, but learns that some friends prefer fin bumps, tail claps, tentacle shakes, or claw pinches.

This adventure takes place by the sea in Durban, Umlhanga,South Africa. Lili & Bunni go cave exploring with Mommy. They meet a new little friend - a very interesting friend. When they find out Shally is in trouble, Mommy quickly finds a way to help her out. Shally is very grateful and offers to teach Lili to swim. Mommy agrees and off on their adventure they go. They need to help a few friends along the way, and it ends up being the best day ever. But...