Best book with riddles & puzzles?

[Satyarth]

Since my upcoming book is all about riddles, which is your favourite book that features riddles and puzzles and codes?

[Satyarth]

And no Dan Brown...that's the most obvious answer. Any other writers who have dabbled in riddles and puzzles?

[A, Crazy.]

Nah.....can't think of any...except of course Dan Brown:) And Ahswin Sanghi too, though I didn't like his Krishna Key.