After I finished the first book, I actually put down the series for a few days before coming back to continue it. The disasters just seemed so OTT, that I wasn't sure if I wanted to continue it. Obviously, I came back to it, and finished reading the series. I wanted to find out what had caused everything, plus there was the promise of zombies (gotta love a good zombie, right?). Anyway, the series took a serious left turn from what I expected in the last book, without that much indication that it was coming in previous books. That part was definitely OTT. The ending was a little disappointing to me, given how it went, but decent enough.