I got this as an ARC.  2 timelines are in this story.  2041 - a series of letters written by Kelly to her daughter.  2078 - several different character trying to survive.  Climate change is occurring and the governments around the world seem to be just giving in to the inevitable destruction coming.  There is a cult that has isolated itself from the rest of the US and has set up basically a survivalist camp. This cult appears in both timelines.  The general story is ok but some of the people showing up seems a bit unrealistic in a dystopian world.  Found it hard to engage and like the characters.