The insidious secret that corrupted Heat Wave's mind is free and looking for a new host-one who doesn't run quite so hot! Unfortunately, it takes over Central City Detective Burns instead, and now she's the one rampaging across the city wrecking shop! Burns must lean on an unlikely source to help her with these new powers, while Flash and Iris West make a big decision about their next move.

Barry Allen's CSI team gets called to the scene of an arson at Iron Heights, and the victim happens to be a well-known Flash Rogue. Barry's new partner thinks it's an inside job, the warden sending a message to the inmates about who's in charge. But the real culprit turns out to be the latest "Force" threat. Can the Flash and Commander Cold snuff this flaming mystery before it becomes an inferno?

On your mark, get set and go for part one of "Grips of Strength"! Barry Allen races to the House of Heroes at the center of the Multiverse to meet with the Flashes of 52 worlds for info on the new forces he's recently encountered. Meanwhile, back in Central City, Trickster's turning informant against Warden Wolfe, but that brings about a sneak attack that Barry and the time-lost Commander Cold must team up to stop-if they can quit butting heads long enough to do so.