Neptune, King of the ocean, sends half-mermaids Emily and Aaron to the land of the midnight sun to investigate the source of the dangerous storms brewing in the ocean.

When Neptune tells Emily and her merman father and human mother to return to Brightport to try to make merpeople and humans work more closely together, Emily faces problems with old enemies, her new, half-merfolk friend Aaron, and a mystery related to a group of legendary lost sirens.

"Shelly Siren and her friends visit King Neptune's royal castle and attend their first ball in this Mermaid Tales adventure"--

Wanting to help a lost baby polar bear return home, Kiki Coral and her mermaid friends worry that the cost of the bear's transportation will prevent them from seeing a concert performance of their favorite boy band.

"Dive into the undersea world of mermaids and join in their amazing adventures. Harmony braves the spooky Pirates' Graveyard. Marina takes on her rivals in the Great Seahorse Race. And dance-crazy Coral makes a bargain with King Neptune"--P. [4] of cover.

Rachel is new to the Kingdom of Neptunia, and she has two secrets--she is half human which only her friend Shyanna knows, and her boy friend is a human boy, Owen, who does not know know she is a mermaid.

Ever since her father disappeared Shyanna's home has been a sad place, but if the twelve-year old mermaid can conquer her stage fright before the Melody Pageant, she hopes to win the contest and bring song back to her mother's life.

Shelly Siren loves playing on Trident Academy's Shell Wars team. But is she ready to complete in the Shell Wars Championships in the fintastically famous city of Atlantis? As part of their trip, the mergirls get a tour of Atlantis and swim through Poseidon's Temple where Shelly sees a spookfish, which according to legend, carries a horrible curse.

At the beach, Pinkalicious and her brother help a tiny mermaid, a merminnie, to go back home.

"When a royal messenger announces that Queen Edwina is coming to tea, Shelly is as jittery as a jellyfish. After all, the Queen of the d Western Oceans is her great aunt. And despite being a princess, Shelly has never met a queen before. How should she act? What should she wear? Then Pearl tells Shelly that the queen is going to take Shelly to live in Neptune's Castle: it's where a real princess would live, Pearl tells her. Shelly is terrified of...