When Echo's big sister Crystal takes the sparkling human object that Echo found near her shell, Echo is one mad mermaid. How far is Echo willing to go to get her find back, and can the sisters set aside their squabbles and learn to be friends?

Students at the Bailey school learn about the Christmas spirit when they set out to discover if Mr. Withers could be hiding a magical unicorn in the stables. Surely it must be a horse...

Could this be a real ghost town haunted by a real ghost?

The Bailey School kids set out to discover whether Eddie's new math tutor (who is also a juggler for the Bailey City Summer Festival) is really a sea serpent.

Unable to comprehend a beloved librarian's imminent marriage to a cafeteria worker who seems to be perpetually grouchy, Pearl becomes jealous when Echo, Shelly, and Kiki are all asked to be flower girls.

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.

"There are some pretty weird grown-ups living in Bailey City. But could the art teacher with braces on her teeth really be an alien from outer space? The Bailey School kids are going to find out!"

The Bailey Elementary School third graders are greeted at camp by Mr. Jenkins, a growling barefoot creature who eats raw hamburgers and avoids lights.

Of all the creatures in the ocean, sea horses are Echo Reef's favorite. They're sweet and gentle and they glide through the water so gracefully. When Echo discovers that Rocky Ridge, one of her Trident Academy classmates, has his own pet sea horse, she wants one right away. Not everyone agrees sea horses should be pets, however. Perhaps they are happiest when swimming freely. But Echo thinks that if Rocky can make a sea horse happy, she can too! Can't...

Some of the kids at school wonder if Mr. Jolly could be Santa Claus. He keeps the building cold as the North Pole and the school building magically clean. Can he make a miracle happen?