Winters's previous series was The Last Policeman, in which a police officer carries on trying to solve crimes even though a meteor is going to collide with the earth destroying life as we know it within a year. So, it's no surprise that he's a master of the alternate universe thriller, easily dropping in details about this America's history and pop culture from the moment they diverge until the present, drawing the reader into the universe without ever disrupting the pace.
An edge of your seat thriller and a masterful exercise in world-bulding.
Overall: A