I highly recommend this book. The author manages to successfully mix the demons Renata faces in her every day life-grief, regret, fear, jealousy-with the supernatural powers that she finds herself fighting. We see Renata emerging (literally and metaphorically) into her best self even as she moves backwards in time month by month watching her friends devolve and seeing their actions in the light of hindsight. The author successfully hides the villain among a cast of suspects of equal measure and although the villain was a surprise the ending was plausible. As I read I wondered how Renata would survive the events of the book emotionally if she survived them physically but the author covered all bases and managed to end the book in a very satisfying manner.