When a criminal invades the CCPD, Barry and Kramer must trust and rely on each other if they are going to make it out safely; Caitlin learns a valuable lesson while out with Snow and Mark.
Barry trusts his instincts during a murder investigation, believing the suspect, despite the overwhelming evidence against him; Iris gives Allegra an opportunity to be a mentor.
Barry and Team Flash get closer to figuring out the Fire Meta but no closer to finding him; Iris, needing a distraction, follows a story to Coast City.
Barry's desire to keep the team safe is tested when Frost recklessly courts danger while trying to stop the Black Flame; Iris tries to help a teen girl reunite with her mother but unintentionally does more harm than good.
Barry and Chester may have found a way to stop the Black Flame from hurting anyone else; Caitlin decides to handle a situation on her own, possibly putting more innocent lives in danger.
With a new Meta terrorizing the city, Joe lends a hand to the local authorities; Barry gets an assist from Cecile who helps to track the mass murderer.
A new speedster in town gives The Flash more than he bargained for; Cecile's powers experience a growth spurt, allowing her to aid Team Flash on an entirely different level.