Holly must solve the puzzle of an old legend if she and the other mermaids are to stop the toxic waste leaking from a wrecked ship, threatening a family of turtles living nearby, and get back to their vital mission for Queen Neptuna.

"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...

"Traveling home by cruise ship should be a relaxing break after Emily's latest adventure, but things take a turn when the ship is overtaken by a pirate king and his crew. After the pirates collect everyone's riches, they steal something even more valuable: Aaron. The pirate king's eldest son takes Aaron captive, forcing him to help guide the pirates to the mythical Trident's Treasure. So Emily dives into action and joins the younger son's crew in...

Continues the undersea adventures of the intrepid young half-mermaid, who plunges into a scheme to reunite with her father.

As they continue their quest to find the Snow Diamonds, Katie and her mermaid friends seek help from the Chief Walrus, but first they must save his young grandson, who sneaked away to play with his best friend, a polar bear.

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.

Itty must figure out why the mermaids of Lollyland have stopped singing.

"Hazel Bly used to live in the perfect house with the perfect family in sunny California. But when a kayaking trip goes horribly wrong, Mum is suddenly gone forever and Hazel is left with crippling anxiety and a jagged scar on her face. After Mum's death, Hazel, her other mother, Mama, and her little sister, Peach, needed a fresh start. So for the last two years, the Bly girls have lived all over the country, never settling anywhere for more than...

On the first night of summer when high tide brings the ocean to the edge of the forest, woodland animals watch mermaids frolicking under a full moon.

"Preparing for the Mermaid Ballet, mermaid best friends Harmony and Echo practice their steps again and again, but when Echo gets stage fright, Harmony comes up with the perfect solution for Echo to overcome her shyness"--