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.

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!

Transformed by the goddess Yemoja into a Mami Wati, an African mermaid charged with collecting the souls of those who die at sea, Simi goes against the gods to save a living boy, Kola, from drowning.

In a society determined to keep her under lock and key, Tavia must hide her siren powers. Meanwhile, Effie is fighting her own family struggles, pitted against literal demons from her past. Together, these best friends must navigate through the perils of high school's junior year. But, everything changes in the aftermath of a siren murder trial that rocks the nation, and Tavia accidentally lets out her magical voice at the worst possible moment. Soon,...

"A mermaid and her otter friend go on a journey to help a lost beluga whale return to the Arctic."--

When Splash the merminnie's flashy tricks get him in trouble, it's up to Pinkalicious and her friends to save him.

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.

"What if Ariel had never defeated Ursula? It's been five years since the infamous sea witch defeated the little mermaid, and took King Triton's life in the process. Ariel is now the voiceless queen of Atlantica, while Ursula runs Prince Eric's kingdom on land. But when Ariel discovers that her father might still be alive, she finds herself returning to a world, and a prince, she never imagined she would see again"--

"While riding the subway home from the pool with his abuela one day, Julián notices three women spectacularly dressed up. Their hair billows in brilliant hues, their dresses end in fishtails, and their joy fills the train car. When Julián gets home, daydreaming of the magic he's seen, all he can think about is dressing up just like the ladies in his own fabulous mermaid costume: a butter-yellow curtain for his tail, the fronds of a potted fern for...

When young Pearl, a mermaid, becomes caretaker of a single grain of sand, she discovers that performing even the smallest task well can transform the world.