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?

Echo's third grade class visit the Titanic and figure out a way of including their new classmate, Anita, who is confined to a wheeled chair.

Shelly Siren loves playing on Trident Academy's Shell Wars team. But is she ready to compete 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.

Echo Reef is doing tail flips because she's going to see her favorite under-the-sea boy band, the Rays! They're performing at her classmate's Pearl's birthday party, and everyone who goes to Trident academy is invited. Everyone, that is, except Echo's best friend, Shelly! Echo doesn't want to miss the Rays, but how can she even think of going to the party without her best friend? Can Echo convince Pearl to invite Shelly? Or will she have to come up...

Pearl needs her merfriends’ help when she’s named Winter Princess and finds out she’s going to be a big sister in this sparkling Mermaid Tales adventure. Pearl is over the moon when she gets the fin-tastic news that she’s been picked to be the next Winter Princess! She can’t help gushing to Shelly, Kiki, and Echo about the beautiful dress she’ll get to wear and how all eyes will be on her when she makes her big speech at the Winter Festival....