The fourth volume of Brian Buccellato and Francis Manapul's New 52 breakout hit - The Flash! A mysterious and powerful Speed-Force killer has left a trail of bodies in his wake and only Barry has the power to stop him. But when the killer stays one step ahead, Barry finds himself face-to-face with the Teen Titans and Kid Flash for the first time. All this will lead to a confrontation with the Flash's most deadly foe, The Reverse Flash! This final volume of Francis Manapul and Brian Buccellato's mammoth run on the Scarlet Speedster collects The Flash #20-25 and Reverse Flash #23.2.