Heaven and Earth by Nora Roberts

Ripley Todd has an okay life. Yeah, she's living with her brother and his new wife and, sure, she's having sort of a dry spell with her own sexual escapades and, well, she's a witch which she's not really enjoying but life is still okay. Then MacAllister Brooke comes to Three Sisters Island. Dr. Brooke is there to study the legend of the Three Sisters. He's very interested in mystical forces and UFOs and then becomes
very interested in Ripley Todd. 

She's not indifferent to him but they have two very different attitudes toward her powers. Of course, Ripley's going to have to learn to trust both Mac and her own powers in order to save her own life as well as those of her "sisters."

Four stars

This book came out 

Three Sisters Island, #2

Follows Dance Upon the Air

Followed by Face the Fire

Hard copy I own

Opinions are my own