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?

Inside the abbey of a Benedictine monastery on tiny Egret Island, just off the coast of South Carolina, resides a beautiful and mysterious chair ornately carved with mermaids and dedicated to a saint who, legend claims, was a mermaid before her conversion. Jessie Sullivan's conventional life has been "molded to the smallest space possible." So when she is called home to cope with her mother's startling and enigmatic act of violence, Jessie finds herself...

"Mallory's mother died fifteen years ago. But her father's last words on the phone were unmistakable: "Find...mother." Shame and confusion have kept Mallory Davis from her home for the last fifteen years, but when her dad mysteriously dies on his mail boat route, she doesn't have any choice but to go back to Mermaid Point. Mallory believes her father was murdered and childhood sweetheart Kevin O'Connor, game warden in Downeast Maine, confirms her...

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.

When a mermaid named Amphitrite arrives at Mount Olympus Academy, she finds herself falling for Poseidon, but his quirks may be too much for her.

Jesse and Daisy and their dragon friend, Emmy, try to recover a Thunder Egg from merpeople who stole it from Daisy near the Inn of the Barking Seal, where the cousins are visiting their grandmother Polly.

Ten-year-old Thora, daughter of a mermaid mother and a human father, has many adventures at sea until she must return to the English seaside town of Grimli and save her mother who has been captured by the greedy real estate developer, Frooty de Mare.

Seventeen-year-old mermaid Lily has been living on land and attending high school, where she develops a crush on a boy but is afraid to tell him of her true destiny as the ruler of the undersea kingdom of Thalassinia.

When an attempt to steal Shirley, a rare sea-unicorn, results in the sinking of their houseboat, ten-year-old Thora, her mermaid mother, and Mr. Walters stay at the estate of old friends and find a solution to the friends' financial troubles, but the would-be thief is still on their trail.