Depends on what you're interested in. Do you want something heavy and factual?

http://www.amazon.com/Blood-Epic-History-Medicine-Commerce/d...

Do you want a first-hand account?

http://www.amazon.com/Surely-Feynman-Adventures-Curious-Char...

http://www.amazon.com/Dancing-Naked-Mind-Field-Mullis/dp/067...

Any particular area of science that interests you?

Also, if you want something non-fictional and thrilling, look into accounts of epidemology.

http://www.amazon.com/Virus-Hunter-Thirty-Battling-Viruses/d...

Also, I read alot of medical thrillers which are fiction by the author Robin Cook. There are many true facts about science mixed in so you might want to consider that.