Struck by a bolt of lightning and doused in chemicals, Central City Police scientist Barry Allen was transformed into the Fastest Man Alive. But there are some things even the Flash can't outrun. After years spent on the hunt for vengeance, one of the Flash's oldest friends has returned, with new enemies hot on his trail-- an unstoppable mob that seems to grow quicker than the Flash can stop them. In the supermax prison called Iron heights, the Flash's most dangerous enemy plans his escape, dreams of revenge, and prepares to put the Flash on ice for good-- driven by a personal grudge the Flash can't see coming. And deep within the Flash himself, incredible new powers are ready to be unleashed-- unforeseen, unexplored abilities fueled by the same Speed Force that makes the Flash run, and which could be his greatest weapon-- or worst nightmare--.