Neptune, King of the ocean, sends half-mermaids Emily and Aaron to the land of the midnight sun to investigate the source of the dangerous storms brewing in the ocean.

After finally convincing her mother that she should take swimming lessons, twelve-year-old Emily discovers a terrible and wonderful secret about herself that opens up a whole new world.

When she incurs Neptune's wrath by finding a diamond ring buried under rocks in the ocean, Emily is put under a curse that will force her to choose to be either a mermaid or a human and split up her parents forever.

Billy and his sister visit their uncle on a Caribbean island and encounter something frightening and strange near the beautiful coral reefs. Juvenile fiction. Mystery.

Uncovering an ancient evil, Serafina, a mermaid of the Mediterranean Sea, searches for five other mermaid heroines who are scattered across the six seas, to save their hidden world.

"Astrid must confront her ancestor, Orfeo, the evil force behind the rise of the monster Abbadon, while Sera and her Black Fins train goblin troops for battle against her uncle Vallerio's death riders"--

Twelve-year-old Kela is still mourning her mother when she finds a mermaid's comb while she and her friend are looking for sea glass on her Caribbean island; such combs have magic in them, and touching it opens a connection to the mermaid Ophidia who can grant her wish, to bring her mother back to life--but all wishes have consequences, and magic demands a price which may prove to be more painful than the loss of her mother.

When Emily Windsnap's boyfriend Aaron is captured by pirates there's only one option - join a rival pirate crew and persuade them to help rescue him. The Pirate Prince agrees, as long as Emily assists in finding the Trident's Treasure first. But as if boarding a pirate ship weren't dangerous enough, Emily soon discovers that pirates hate mermaids. If her true identity is revealed, her life - and Aaron's - will be at risk. How will Emily keep her secret...

Once again Abby and her brother Jonah go through the magic mirror in their basement, and this time they find themselves interfering in the Little Mermaid story--and needing to set things right and make sure everyone has a happy ending.

A new mergirl shows up at Mount Olympus Academy-- and Poseidon just might be her perfect match in this seventeenth Goddess Girls adventure. Amphitrite is a mergirl with a big crush on Poseidon but will his quirks make her fall out of like?