Real name John M. Kimbro - also wrote as Kym Allyson, Ann Ashton, Charlotte Bramwell, Jean Kimbro. He was the author of over 80 books including the 40 book Gothic series The Saga of the Phenwick Women.
Not sure how I came to own the 39th book in a series, but I did dig this novel as a kid. Iris, one of a long line of special women, falls in love. Her beloved then becomes possessed by the spirit of a dead relative. My tween self loved the spooky setting and the witchy powers.