Mermaid Echo is doing tail flips because she's going to see her favorite under-the-sea band, the Rays. They're performing for Pearl's birthday party and everyone at Trident Academy is invited except Echo's best friend Shelly.

A shark has been spotted in Trident City! Pearl Swamp is so scared, she needs a shark Guard to escort her to and from school. She doesn't trust anyone who likes these terrifying creatures, especially Kiki Coral, who isn't nearly as frightened as Pearl. And to make matters worse, Pearl accuses Kiki of stealing her precious pearl necklace! Will the sharks destroy the peace of their sparking city? Or will the mergirls have to swim in dangerous deep-sea...

Kiki Coral has an amazing gift: she can see the future. She doesn't have visions very often, but they are always surprising! When Kiki sees a vision of her classmate Rocky Ridge coming face-to-frightening-face with a gigantic leatherback turtle, she is frightened to the tip of her shiny purple tail. Can Kiki save Rocky from his dangerous fate? What if no one in Trident Academy believes her scary prediction?

When Echo injures her tail, she can’ t compete in the Poseidon Tail Flippers team competition. Will Echo find a way to help her team win from the sidelines?

Echo Reef is tail-flipping with excitement when she find a human object. But when her older sister claims the object for her own, how far will Echo go to reclaim it?

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.

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.

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 party becomes an overnight extravaganza at the People Museum, complete with a scavenger hunt and way-too-scary stories! Shelly is worried about spending the night in the museum's dark spaces and creeking exhibits. Surprisingly, everything goes swimmingly - until strange, glowing lights mysteriously...

Mermaids Shelly and Echo are excited to begin third grade at the prestigious Trident Academy, but snooty Pearl, jokester Rocky, brilliant Kiki, grumpy Mr. Fangtooth, and an argument over their first project challenge the best friends. Includes facts about marine plants and animals and words to the Mermaid Tales Song.

"Rosie is a little mermaid who loves dancing with dolphins and building towering sandcastles. But she's just moved to Trident City and doesn't have one single friend to join her. She's too young to go to Trident Academy with her older cousin Rocky, her parents are busy at work, and Manny Nanny, who takes care of Rosie, can be kind of boring, even though she's super nice. Then, Rosie meets Aqua and finds that having a new friend might be more trouble...