That's a good point, Devi. Sometimes the gap between books can be so long, with other books read inbetween, that you can forget what become important threads in later books. Especially difficult for me as I tend to borrow most of my books rather than buy (if I buy, I want to keep 'em, and I just don't have the room!). I recently read The passage by Justin Cronin, the first book of a, so far, unwritten trilogy. I know that when I get to book 2, I will have forgotten large parts of the plot and minor characters. But if I had a photographic memory, there'd be no fun in re-reading!