Required reading for my daughter's Young Adult Literature class in her Masters of Library Science program. She loved it so I read it too. I thoroughly enjoyed this story of 17-year old Che, the apparently only sensible and sensitive enough individual in his family to realize his 10-year old sister Rosa is a psychopath. While simplified a little, I thought the psychology base of this book was very sound and believable; maybe I've been a little too close to some of this pathology in my work. I really liked that the author took the time to give us a decent-sized cast of characters and fleshed them out - it wasn't all psychological thriller intensity. But bottom line: this was a heck of a very creepy ride and I couldn't put it down. The slower-paced chapters in the middle just set us up for the last 100 pages of twists and reveals and horrors. Great ending, but I think maybe there's a chance that we revisit these characters in another book? I hope so!