From Hugh Howey's world of WOOL. Sheriff Nathan Parker knows something isn't right within the silo. On days like this, when the air feels stale and constricting, it has a way of making even the mundane seem suspicious. Things happen...unnatural things. A young, reliable farmer doesn't report for work. Some daring soul smuggles a metal file out of Mechanical. A strange message, left in blood: six letters that are as unthinkable as they are ominous... V A M P I R