This is my first Ruth Ware and I really did like it! I remember reading Turn of The Screw for the first time in college and being the only one in my class who liked it, lol. I really enjoyed the epistolary portion of this book, I think I would have liked it more if we had gotten more of that. For portions of this it doesn't actually read like she is writing a letter to someone. 

The twist was great, and a very satisfying reward for a book that's pretty slow in its pace.