Book 1 in the Dresden Files. 
 This book was a lot of fun! Dresden kind of reminds me of Parker's Spenser- wise-cracking, always in trouble, a bit of a screw up, but with an undeniable charm. I really liked the world Butcher created as well: gritty and realistic, it's modern day Chicago which just happens to be chock full of magic- dark and otherwise- around every corner.