Cormac McCarthy
I've become intrigued by this author.
There are a number of things about him that I find intriguing, but here's the thing. His work is found under "fiction." Not under a specific genre, yet his novels are genre, but they transcend genre.
No Country for Old Men - clearly a mystery/suspense.
The Road - Post Apocalyptic science fiction novel. But very literary.
Blood Meridian - I most recently read this. It's a western.
McCarthy is a great American author. He has earned the greatest awards - including the Pulitzer - which are mostly reserved for non-genre writing. Yet, here he is, experimenting with genre fiction.
He pushes the boundaries and the conventions of the genres to create great American fiction.
You should try him out.