Echo the mermaid loves sea horses more than anything else in the entire ocean. She thinks the gentle creatures are graceful and beautiful, and she desperately wants one of her very own. When she finds out that a boy in her class at Trident Academy has a pet sea horse, Echo decides she simply must have one too. However, keeping a wild ocean creature as a pet is a complicated debate in Trident City. Many merfolk believe sea horses should be left to swim freely in the wild. Echo is convinced that she can provide a happy, loving home, but capturing a wild sea horse forces her to question what is truly best for the animal. This thoughtful chapter book explores themes of animal welfare and responsibility beneath the waves. Young readers will be drawn into Echo's emotional journey as she learns the difference between loving an animal and owning one.