I've just read Michael Frayns's 'Spies' ~ it's very good ~ a lot of thought has to go into reading it.

http://books.guardian.co.uk/reviews/generalfiction/0,,647609,00.html

http://books.guardian.co.uk/digestedread/story/0,,647130,00.html

http://www.complete-review.com/reviews/fraynm/spies.htm

The Dark Tower series by Stephen king, EXCELLENT adventure, romance, horror, fantasy books I have ever read!

"Yes, it's very good.
"It's basically better than anything else he has ever written.
"And it's better than Lord of the Rings & Harry Potter as well ~ cos it references both of them."

Thus saith my elder son.