You should read Book 3 before the next season of the TV show airs. That way you can drive people crazy by knowing what's going to happen, and have the power to threaten to tell them spoilers. Mwuhahaha (evil laugh)
Haha I read the books and finished book 5 after I watched the series on TV. Now I can't differentiate between books 2 and 3. I let a lot of spoilers loose