India Finch is part-human and part-mermaid in this e-book. In ocean water, special healing powers awaken in her, allowing her to help the merpeople. However, India longs for greater adventures than healing rashes, so when she hears rumors about Neptune's trident, she decides to search for the powerful tool alongside her mermaid friends. The four friends soon find themselves facing off against dangerous and deadly mer who want Neptune's power for themselves.