Umberto Eco - The Name of the Rose, Foucault's Pendulum (much better than any of Dan Brown's works I think, with quite different message)
Orhan Pamuk - My name is Red
Fyodor Dostoevsky - Notes from Underground
Antoine de Saint-Exupéry - Citadelle, The Little Prince
Ernest Hemingway - For whom the bell tolls

just to name a few