Take some deep breaths before you start this one, because you will need the extra oxygen. If you have any questions about what a caldera or magma chamber is, hopefully those were cleared up in Yellowstone: Hellfire. For a work of fiction, it is loaded with facts that are bound to peak your interest. When we left them in Yellowstone: Hellfire, Jake, Ashby, Rita and Dusty, where being helicoptered as far away from the volcano as possible. The devastation was immense, like nothing the world has ever seen, but scientist knew could happen. They make it as far as Sheep Mountain in central Idaho before crashing landing 10,000 feet up, due to the effects of the eruption. 200 miles away is not far enough. The nearest town is Challis, which is a 30 mile trek under the best of conditions, and these are not the best of conditions. Smooth sailing now, right? Um, no. Things are about to speed up and I suspect this was the intent of the author. It has been 100 days and the Yellowstone volcano isn't done yet. The caldera continues to grow, spewing ash into the air. To top it off, there is a manhunt going on for a bunch of criminals, right in the direction they need to travel. In search of diesel fuel for their motor home (which they bought in Challis) , they come across an abandoned farm house and plan to spend the night. Jake and Ashby are invaded by 6 would be bad guys in dune buggy's. You had to know they would run into the anarchists.. They won't be attacking anyone any more. After fast talking their way through another road block, they finally arrive at the Mad House, a cabin which belongs to Jake's parents. Nice cliff hanger at the end. Okay you can breath again.