Looking for "that" book.

Hello people.

I am a huge fan of sci fi stories/sagas and fantasy worlds. Read all Harry Potter books, seen the movies countless times, read eragon(the first one, will read the rest of them) and "the mage " of Raymond E. Feist.

I would love some suggestions on books that really hook you up, you can't stop reading them. Doesn't have to be sci fi nor fantasy.

Anything in mind?

Cheers, Mekktron