Best friend kitty mermaids Coral, Shelly and Angel plan to visit Tortoiseshell Reef to find a special treasure for show-and-tell at sea school, an endeavor that is challenged by Coral's fear of swimming too far away from home.

Unable to comprehend a beloved librarian's imminent marriage to a cafeteria worker who seems to be perpetually grouchy, Pearl becomes jealous when Echo, Shelly, and Kiki are all asked to be flower girls.

After receiving a message from Skystar, the princess of the seaponies, Fluttershy and her best friends head to Seaquestria for an underwater vacation.

Shelly can't wait to celebrate her birthday with a small sleepover and her grandfather's homemade pizza. But when Pearl gets involved in panning, the little partby becomes an overnight extravaganza at the People Museum, complete with a scavenger hunt and way-too-scary stories! Shelly is worried about spendig the night in the museum's dark spaces and creeking exhibits. Surprisingly, everything goes swimmingly - until strange, glowing lights mysteriously...

"Princess Lana can't seem to speak up in class at the Royal Mermaid Rescue Crew School, even when she knows the answer. It's much easier to chat with her new friend, a horned creature named Spike. With Lana's help, Spike discovers he's a narwhal, and together they swim north to find his long-lost family. The chilly Northern Seas are full of new adventures--but also an emergency! Can Lana finally find her voice and save the day, or will she freeze...

Pearl Swamp is not happy when her selection as the next winter princess is overshadowed by her family's decision to adopt a baby boy.

Mermaid kittens and best friends Angel, Shelly, and Coral dive headfirst into working on their art project together, until their fun is nearly ruined when they run into their rivals, a trio of purrmaids called the Catfish Club.

"When Oliver's explorer parents go missing, he sets sail on the rescue mission with some new, unexpected friends"--

In 1899 on an island off the coast of Maine, fifteen-year-old May learns why she has always felt different from the other girls in her small town, but must keep hidden that she is a mermaid or risk attracting the attention of a dangerous hunter, and losing a boy for whom she cares.

Listening to her aunt's story about a fairy that visits mermaids while they sleep to purposely tangle their hair, Echo resolves to catch the fairy in the act before her skeptical friends ask her to figure out whether or not fairies are even real.