I need a good book that is gonna make me think...

just read classics Dracula, Frankenstein, war and peace etc. and or lord of the rings. 

Twilight. It'll make you think about human intelligence.

The Average American Male

" Twilight. It'll make you think about human intelligence. "

The Innocent Man by John Grisham or the Alchemist by  Paulo Coelho.
the best books I ever read . Yeah they made me think and they improved the spelling too.

Neuromancer or maybe Do Androids Dream of Electric Sheep? by Philip K. Dick. I dunno, it depends on how meta you wanna go with this thinking thing.

" Anything by P.K. Dick will blow your mind. "

In the meantime, I suggest reading through the old Achewood strips. They're really good.

I'm reading H.P Lovecraft's Necronomicon (short story collection) and Dante Alighieri's Divine Comedy at the moment. Can only recommend both of them.

1984.
The Great Gatsby.

Shutter Island 

Metro 2033

Since you're here on Giant Bomb, I'm assuming you have at least some appreciation of the vidya games. Masters of Doom is an incredible look at Johns Romero and Carmack and how they founded id Software and and follows their story from before Commander Keen all the way to Daikatana. It's really awesome, and, as someone who was born in 1991 but grew up playing Doom quite a bit, it was a really interesting and entertaining read.

the secret

I wonder if anyone actually reads the post content, sometimes. 
 
People are suggesting novels with pretty lofty themes, or even accepted classics, while the OP specifically stated he likes a shit story ala The Da Vinci Code. 
 
Labyrinthe by Kate Mosse is supposedly very good. It's basically about the quest for the Holy Grail.

American Gods - Neil Gaiman

Anything by Michael Crichton (Andromeda Strain, Sphere, Jurassic Park, ect.). Most of his stuff has a similar flow to The Da Vinci Code.

"  or the Alchemist by  Paulo Coelho. "

Seagalogy by Vern

Confederacy of Dunces

" Confederacy of Dunces "

" @DelroyLindo said:

" Confederacy of Dunces "

I read that book two years ago and I still haven't made up my mind on it. Ignatius is such a fantastically disgusting person. "

Ralph Ellison's Invisible Man. 
Foucault Pendulum Umberto Eco

Go pick up a compilation of H.P. Lovecraft, his stuff is pretty cerebral and you can get a lot of his work for very cheap.

I have said this in all of the other book threads. Crime and Punishment!

Johnny got his gun

1984 George Orwell

Starship Troopers by Robert A. Heinlein, makes you think politically, plus it's a good book for guys.

Apart from the NKJV Bible, I recommend "The Third Man", a quick read about post-WW2 spy intrigue in Vienna. It's on Amazon.

Michael Crichton is great if you like Sci Fi with a HEAVY emphasis on the Sci. There's a lot of research put into the science behind those books.
Jurassic Park is still one of my favorite books and as much as I enjoyed the movie its exponentially better then the movie.

Any Stephen King book, i will make you think on why you want to read... because reading is sooooo linear. 

" Apart from the NKJV Bible, I recommend "The Third Man", a quick read about post-WW2 spy intrigue in Vienna. It's on Amazon. "

farenheit 451