I'm kind of surprised that this episode is only rated a 8.4 I thought that this episode was one of Castle's best! It had everything, good acting, great writting, twist, and unexpected turns, and the conflict between good and evil all shoved into 43 minutes and 9 seconds.
I only saw the ending coming, because I really really didn't like Lila's brother. I don't know why he just seemed like a jerk, and probably a brat.
I thought the episode was a fairly clever idea for a crime show (and I've seen amost every crime show episode since 2000) A great episode, and will definetly one day be a Castle Classic.