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?

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...

Told in alternating voices, Crest, a merperson, who grudgingly undergoes a mandatory sojourn to help a human within one moon cycle or risk staying on land forever, suddenly develops feelings for his beneficiary Sean, leaving them torn between two worlds.

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.

Every night Lampie, the lighthouse keeper's daughter lights the lantern which warns the ships away from the rocks, but when the light goes out one night, a ship is wrecked and Lampie is sent to the Admiral's Black House in disgrace--there she finds and befriends the Admiral's son, who was born with a tail, and together they are pulled into an adventure of mermen and pirates, and secret identities long concealed but soon to be revealed.

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

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...

Un buen día la Luna desaparece y Mirco y Mircoleta abandonan Mircomarca para buscarla. Nunca antes habían salido de su casa, pero esta vez y como Mirconquistador ha sufrido un accidente, deciden ponerse en marcha y se dirigen a visitar a una sirena que...

When sixteen-year-old Sadelyn Hanson washes up on the shores of Windwaithe Island, her beauty and the strange marks on her wrist make superstitious locals suspect she is a mermaid. Feigning amnesia, Sade hides a far worse secret: she was sailing to her own murder trial, when she was thrown overboard by the real killer, the cunning and cruel Captain Westwood. Sade's quiet effort to rebuild her life on the island is threatened when she meets an actual...