I want to start by saying that you shouldn't let the 4 sexual rating scare you away from this one. I felt I had to rate it that way because of one crazy sex rite done by our bad girl. But it's short and easily skippable (is that a word?) if you don't want to read it. Seriously, like one paragraph.
Shannon has settled into her life in Partholon with her centaur husband and endless supply of handmaidens ready to wait on her every need. The danger seems to have passed and life is returning to "normal" once again. But she's uneasy, and with good reason. She finds herself ripped out of Partholon into her old life.
I enjoyed this story, but I had some issues with it as well. Seeing Shannon come in to her own as Epona's Choosen and learning to trust herself and the world around her was great. But I didn't like the twisted love story that wove through the middle of everything. When she meets the man that mirrors her husband things got a little tricky. I totally get her confusion and attraction to him. But I didn't like where that always led.
Finally meeting Rhiannon was very nice though. I love how damaged her character is, and the glimpse into her past only cements that she isn't a truly evil person, but more a victim herself as well. She just didn't deal with things as in a very healthy way. Finally being able to compare her beside Shannon showed sides of both that were quite eye-opening.
A great addition to the world of Partholon, but I just didn't enjoy all the aspects presented.