Thriller
Angels & Demons
Robert Langdon's first sprint through Rome — symbology, secret societies, and a countdown I couldn't put down.
Why it's on the shelf
Pure adrenaline. I read this faster than almost anything else on this list — Brown's short-chapter, cliffhanger-every-page formula is engineered to keep you turning, and I'm happy to be manipulated by it.
The science-versus-religion thread is more interesting than the later sequels got credit for. I don't take the history too seriously, but as a thriller it absolutely delivered.