"The Princess in Black and her friends are enjoying a day of sun and sea on Princess Sneezewort's royal boat when a real, live mermaid princess emerges from the waves! Eeeeeee! Princess Posy needs their help protecting her very cute sea goats from being eaten by a very greedy kraken. But the princesses and the Goat Avenger quickly realize that fighting underwater can be tough for land dwellers, and only the mermaid Princess Posy can save the day....

Assaulted and left on the cliffs outside of her grim Alaskan fishing village by her abusive, alcoholic uncle, fourteen-year-old Luce expects to die when she tumbles into the icy waters below, but when she instead transforms into a mermaid she is faced with struggles and choices she could never have imagined.

Each of King Neptune's 50 mermaid daughters boasts a special talent, except for little Minnow, who seems to be good only at asking questions. When she finds a strange object, Minnow follows her questions to a wondrous place and finds answers, including the answer to the most important question of all: Who am I? A gorgeously illustrated story about finding one's purpose.

Uncovering an ancient evil, Serafina, a mermaid of the Mediterranean Sea, searches for five other mermaid heroines who are scattered across the six seas, to save their hidden world.

Two children set out to capture a mermaid, but she manages to escape all of their traps.

When mermaid Vera and Octo-boy Beaker investigate what seems like a wave of vandalism in Tidal Grove, they discover a baby Mantis shrimp who does not fully understand his own power, and help him find his family.

Once again Abby and her brother Jonah go through the magic mirror in their basement, and this time they find themselves interfering in the Little Mermaid story--and needing to set things right and make sure everyone has a happy ending.

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! After all, no proper treasure hunt is without some adventure. But when the grandest treasure yet is stuck in a deep, dark rift, Oona's not sure if she can dive right in. What might be waiting for her in those unknown waters?

"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...

One day, a resolutely ordinary young man named Mr. Whatwilltheysay returns home to find Grain-of-Sand, a mermaid, waiting for him in his favorite armchair. Despite his objections, the two embark on a series of very watery adventures as he tries to get rid of her. But ultimately the thought of being seen with half a fish is simply too much for Mr. Whatwilltheysay to bear--what would people say? So broken-hearted Grain-of-Sand returns to the sea in...