Interesting concept, fast-paced and compelling. I particularly liked the historical elements as the author introduced each of the 'girls'. The main character, Kirby, is well-done and interesting to read about. Ultimately though I found it a bit unsatisfying; I think things about serial killers are just not for me. It's not like there is a good reason to go around killing people, and often an attempt to create a backstory that 'explains' it is just reductionist - but it ended up feeling a bit empty to me.