I have always loved mystery novels. My fondness goes back to reading second hand Agatha Christie (Ms. Marple) as a young teen.
http://us.agathachristie.com/site/home/ and Nero Wolfe (author Rex Stout) novels.
http://www.nerowolfe.org/htm/stout/author.htm I am quite sure that I was a nerd or what ever it was called then.
These days I am enjoying the new writers. There are so many female amature and super sleuths to choose from now. Of course we can't forget author James Patterson who gave us Alex Cross and later
The Women's Murder Club
What your fave mystery novels or characters?