In my naivety, I thought people read mysteries. Oh and then of course, people like crime, thriller, spy, and suspense, and so forth. But no! I found Stop, You're Killing Me .com which is the most amazing catalogue of mystery books I've ever come across!
Here's some mystery genres you may never have known existed...
~ CAT MYSTERIES.
~ SUDOKU MYSTERIES
~ FLY FISHING MYSTERIES
~ CLERGICAL MYSTERIES
~ ANTIQUES MYSTERIES
~ EGG MYSTERIES
In fact, from what I've seen, you can pretty much specify exactly your amateur sleuth's occupation, interests, gender, sexual orientation... No: REALLY. Don't believe me? Click here.
(Ooh! And there's even Library Mysteries!)