I seem to like the medical mysteries books. I've written about several before, or I think I have.
Anyway, give this author and her books a look. Highly recommended.
A few others in the queue are The Housekeeper and the Professor as recommended by my friend Dr. Lamascus and The Riddle of the Labyrinth: The Quest to Crack an Ancient Code as recommended by the other Dr. Lamascus(also my friend). My wife has me working through Dracula right now which I will undoubtedly finish on an upcoming plane ride. And I'm going to re-read Ender's Game since they are making a move about it. Ender's Game routinely appears on best sci-fi lists and it is usually at the top. If you've not read it, then take a look.
The kindle is currently full of books that are calling to me...