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...

Shelly is a princess! A real princess! It's been a well-kept secret in Trident City, but now the word is out, and Shelly doesn't know how to act! Should she start wearing a glittery crown? Or move to a grand undersea palace? Will her friends have to call her Your Highness? Being a princess may be exciting, but Shelly's not sure she can truly play this royal part.

"Two merpups named Lilly and Fin must escape from the clutches of the humans who want to add them to their collection of rare aquatic creatures"--

While concentrating on her goal of becoming popular, including hiding her eccentric family from the cool crowd, thirteen-year-old Molly discovers that she and her older sisters are half human, half mermaid.

Vera the mermaid and her half-octopus friend Beaker meet three friendly krakens on a field tip.

Best friends Molly, a human, and Merrin, a mermaid, visit the Mermaid Moon festival on the night of Mermaid Moon, the one time each year mermaids can leave the sea.

"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." --Google Books.

Siren Phillips has lived her life thinking she's an ordinary girl, in an ordinary town. On the eve of her twelfth birthday, however, she learns that she is far from ordinary. Destined to turn into a mermaid at the age of twelve, Siren must struggle with her new reality, saying goodbye to her mother and friends while she transitions into the water. To make matters worse, a group of hunters is after her, trying to catch her.

Desmond and Andres visit the acquarium where they discover a mermaid whose song puts anyone who hears it under a spell.