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

As Serafina uncovers more clues about the talismans, Neela ventures into a sea dragon's nest, and Ling learns the identity of their foe.

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?

Kitty helps her best friend Unicorn accomplish his dream of being a mermaid, but despite an elaborate DIY mermaid tail, the friends' trip to the beach does not go as planned and Unicorn's insecurities ermerge.

When Neptune tells Emily and her merman father and human mother to return to Brightport to try to make merpeople and humans work more closely together, Emily faces problems with old enemies, her new, half-merfolk friend Aaron, and a mystery related to a group of legendary lost sirens.

During her family vacation on a floating palace, Sofia befriends a mermaid, and through their friendship helps save the mermaid's kingdom.

"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"--

The New York Times best-selling series continues with the half-mermaid embarking on an icy and perilous journey to the Land of the Midnight Sun.Strange storms are blowing up from the ocean, caused by the nightmares of Neptune, King of the Sea. Convinced that his dreams herald an approaching threat, Neptune enlists half-mermaids Emily Windsnap and Aaron for a top-secret mission to find and eliminate the source of the trouble. But Emily and Aaron quickly...

Five young mermaids start out together on an adventure but, one by one, find a reason to stay in a different sea in this illustrated, rhyming, count-down book. Includes information about mermaids, oceans, and sea creatures.

"Runa will not let her twin sister die. Alia traded her voice to the Sea Witch for a shot at happiness with a prince who doesn't love her. And his rejection will literally kill her--unless Runa intervenes. Under the sea, Evie craves her own freedom--but liberation from her role as Sea Witch will require an exchange she may not be willing to make. With their hearts' desires at odds, what will Runa and Evie be willing to sacrifice to save their worlds?...