Circle of Three #12: Written in the Stars by Isobel Bird

Ever moving, ever changing, stars and planets come and go. Those who watch their movements say, "As is above, so is below."

Astrology—the study of the stars—is said to reveal the truths of the universe. Cooper, Kate, and Annie find this to be alarmingly true, and their progress on the Wiccan path is nearly undone by what the stars tell them.