It's a pity that not a lot of people know of this book or even the author. It reads like a Julie Garwood romance plus the fantasy.
The heroine Sianna is one of those pure of heart healer types whose goodness is demonstrated in her every action which leads to winning people over. She has to maintain a lie to her captors that she is her sister in order to preserve her and her sister's life; this is a cause of tension in the novel when they believe her to be a murderer and want to treat her as such. The love between Sianna and Kyne is poignant because she has never had anybody love her and Kyne is disgusted with his attraction to his enemy. It makes for some very frustrating moments as well as some bittersweet ones. However, through Sianna's emphatic abilities readers will understand the motivations behind their actions and feelings. There are one or two moments of cheesiness that comes into play but one has to just accept it. In one scene, Kyne doesn't know how to do something and so Sianna says, "Believe." Yep, I had to make a huge eye roll at that.
Still, this book has its merits. Usually books of this sort are either heavy on the plot and light on the romance or heavy romance but no plot. Crystal moon is well-balanced in that arena with a fully fleshed out plot and a romance that grows believably.