The Witches of Half Moon Island by Vickie Carroll

A legacy has its burdens as well as its gifts. This becomes clear to Anna and her cousins when an ancient enemy comes for revenge. Can they banish this evil once and for all, or will the curse hold? The witches of Half Moon Island must band together and revive their legacy, embrace their powers, and fight for their lives against this curse that has once again appeared in spirit and human form on their island home off the coast of Savannah.