- The Man Who Mistook His Wife for a Hat ~ Oliver Sacks, 1985. This book contains tales of some of the Sacks's patients. A very interesting read. 
- The Mind's Eye ~ Oliver Sacks, 2010. 
- Spy Catcher (Autobiography of a MI5 agent) ~ Peter Wright, 1987. 
- Applied Cryptography ~ Bruce Schneier, 1994. Approachable and succinate language of this book makes it easier to understand.