This book was almost a five star for me, but not quite. I clearly enjoyed it and found it compelling, since I stayed up til almost 2am on a weeknight to finish it, but I also felt like the story got a little shaky towards the end. Throughout, the writing and characterization were good, and the way the mystery is structured (alternating between the night of and the days after) kept me engaged without feeling like it was deliberately withholding information in an inorganic way (thanks to the memory loss angle). However, without spoiling anything, there were a few bits close to the end which fell flat for me, and I was confident I knew whodunnit (and I was right) well before the main character figured it out, and as a result, was quite frustrated for the last few chapters, waiting for her to figure it out. 
 In the end, it was a fun, fast-paced and moderately creepy mystery/thriller which I'd recommend for a quick weekend read. Nothing groundbreaking, but certainly enjoyable.