I'm writing the second Nicholas Colt thriller, and the storyline in book #1 is very much pertinent to the storyline in book #2. I don't want to assume that everyone who reads book #2 will have already read book #1, so I'm trying to incorporate all the back story into the first few chapters. I'm using some exposition, and some dialogue, and trying to avoid the dreaded "info dump."
For those of you writing a series, how do you generally handle back story?