I just became acquainted with this author's series recently. I read (and enjoyed) Thyme of Death, and Witch's Bane, but this book is the best so far!! I enjoyed the setting and atmosphere, and the off-stage (so to speak) deaths (Witch's Bane and even Thyme of Death had some pretty bloody, gory deaths, which I don't care for).
One minor quibble: the author could do with a bit of better copy editing. 1) She had too many nuns name Rose (and variants thereof) -- it got confusing. 2) Early on in China's stay at the monastery, she & Maggie go up the cliffs at night. Just before they do, the author mentions a "sliver of moon" hung low in the sky, but when they're on the cliff, all is bathed in moonlight!! You don't get much moonlight from a sliver, and suddenly the moon is described as "quarter round" -- huh?? "Quarter round" I take to mean full -- certainly, the landscape won't be bathed in moonlight under a crescent (sliver) moon.
There is just as glaring a copy editing problem in Witch's Bane; unfortunately, it's just as China is realizing who the murderer is, so I'm not going to describe it here online.