The Soviet Union's Bioweapons program during the Cold War. Fascinating, disturbing, and a bit outdated. I'd love to read an updated version. I also felt he got a bit bogged down in the specifics of the Soviet politics that he was involved in, but maybe that really was necessary to the story. Scary, scary stuff.
Mind blowing story of biological warfare. Lots of detail. Lots of names. Left me with lots of unanswered scary questions.
