In this new hardcover, 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 of him, Barry finds himself face to face with the Teen Titans and Kid Flash for the first time, which leads to a confrontation with the Reverse Flash! Don't miss these stories from THE FLASH #20-25, and #23.3: REVERSE FLASH!