Mermaid Echo is doing tail flips because she's going to see her favorite under-the-sea band, the Rays, but they are performing for Pearl's birthday party and everyone at Trident Academy is invited except Echo's best friend Shelly.
Jake finds that he and his cousin can change from swamp monsters into normal kids. Then they go to the third grade where his cousin causes so much trouble that Jake fears he will be stuck in the third grade forever.
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.
Melody and her friends believe the new crossing guard, Angela Michaels, who also happens to be a karate teacher, is really a guardian angel sent to watch over the kids from Bailey School, and maybe perform a miracle or two.
When Shelly's great aunt, Queen Edwina, plans on stopping by, the mermaids prepare for a royal tea, but Pearl thinks there may be another reason she is coming by.
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?.
"When Echo injures her tail, she can't compete in the Poseidon Tail Flippers team competition. Will Echo find a way to help her team win from the sidelines?"--Provided by publisher.
