Guardian Witches - We Witches Three Seasons, #4

The Final Books in the We Witches Three Series! Melinda Howard has made a decision: to stand on her own two feet and take responsibility for her life, both personally and in her duties as a witch. However, the ground under her feet is more like the sandcastles she made as a child, built in an afternoon, and in the pathway of the inevitable tides that threaten to wash away everything she's worked so hard to accomplish.
And since the Feyk are not giving up their fight to control the Power Source, tensions are high as the Howard family, along with their new allies, prepare for the inevitable battle to come. Meanwhile, a new threat has their sights set on The Demon Isle, and a most unexpected guest arrives, shocking them all... Includes the Original Standalones, We Witches Three Books 11-14:Isle of JudgementIsle of MagicIsle of PromiseIsle of Dawning