I read Ashfall last year and loved it. Ashen Winter takes place shortly after the events in Ashfall. Due to the eruption of the Yellowstone supervolcano and the resulting volcanic winter, the temperatures have dropped to below freezing and Alex's world is even harsher than it was in Ashfall.The action in this series is immediate and non-stop. Some events I found to be a bit unbelievable, but it was still a really fun read. I wish I had been able to read this as a readalong. It's the kind of book you can go on and on about with your friends. The main characters are very likeable. Alex is a nice guy and Darla is a badass, but they both do some pretty boneheaded things.Even though I have some minor issues with Ashen Winter (possibly too much action), I still love this series hard core. I love the extreme take on what it would be like to survive a supervolcano eruption. The evolution of human reaction to such extreme conditions is awesome and extremely frightening. I know I said some of the events were unbelievable, but the world Mike Mullin has created is quite realistic and very thought provoking. Did I mention frightening?The Ashfall series is one of my favorite series. If you haven't read Ashfall, you definitely need to start there before picking up Ashen Winter. The next book in the series is called Sunrise. SUNRISE! I hope we get plenty more time surviving the volcanic winter, but hooray for surviving to see the sun!