Susie, Elizabeth, Tess, and Amelia have been together for as long as they can remember. But things are changing this year, and their friendships are being tested like never before. The amulets they wear as a symbol of their friendship give them elemental powers. When Amelia goes missing, they journey from California to Hawaii to save her. Will their new powers be enough to save their friend and an ancient mermaid goddess trapped on a forbidden island?

"A Hawaii-set, paranormal middle grade series starter that tells a story about the power of friendship and sacrifice. Spudich maintains an atmosphere of peril that keeps the pace lively, but she never makes any scenes too scary for older elementary school- age readers to enjoy. The conclusion offers the touching lesson that people can change but still remain close friends. Young fans of fantastical fiction will also enjoy this book's magical system, which is inventive without being overly complicated." - Kirkus Reviews

For fans of Babysitter's Club, Moana, and the Avatar series.