Thomas Perry
I like them all, especially the Jane Whitefields, but my favorite is still The Butcher's Boy. Reminds me of Hammett's Red Harvest.
http://www.thomasperryauthor.com
J. K. Rowling
I read all of these at least four times. I think this was when I first became aware of the structure of plots and began to think as a writer.
http://www.jkrowling.com/