This story reminded me of a movie called Citizen X, which was about the Russian serial killer Andrei Chikatilo. This bothered me a little bit but the back drop of the Soviet era and the relationship between Leo and his wife made up for it. The story is very well told and if you haven't seen Citizen X or don't know anything about Chikatilo then the similarity won't bother you. Nice twist towards the end that I wasn't expecting. I look forward to reading more from this author.