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...

"While out walking a dog one day, Adam notices a shaggy, lonely pony standing by herself in a field, without food or water. When he continues to see her day after day, he realizes that this another case for the Pet Rescue Club--four animal loving fourth graders who come together to help animals in need in their suburban home town"--