The First Book: You'll find some random numbers and spaces in the spaces where the numbers should be on pages 129-153 middle of the book. Anyway, the numbers are letters of the alphabet. I'll let you find the message.
Book 2: I don't know...I'm working on it!
Book 3: The throwing sword thingy at the beginning of the book, and I mean you open it to where the cards are, and you look at the sword thing. It has a letter, a dash, and then a symbol. Through pages 39-67 there are symbols, and I think you can figure this out now. Decode. Ex: A-(square)
Book 4: There's a tablet in the beginning of the book, and just like the 3rd book, decode. Don't worry, you don't have to guess too much...but if you get stuck, the message is: Alistair was there the night they died.
Book 5: I don't know...I'm working on it!
Book 6: In the beginning of the book there's a list of numbers. Go the pages. Look at the words right above the number pages. Usually they say: "The 39 Clues" or "In Too Deep", but they will say something different. In order, they will make sense.