The Flash Vol. 2: Speed of Darkness (Rebirth)

"A new storm brews over Central City and disproves the old adage about lightning never, well...you know. Just as Barry begins to feel overwhelmed fighting crime, a new speedster debuts--but just where did this amazing new friend come from? Spinning directly out of the epic events of DC UNIVERSE: REBIRTH, the Fastest Man Alive finds himself at the center of a DC Universe at a crossroads"--