SECRETS FROM THE PAST

After their defibrillator malfunctions on a call, Brett and Violet search for answers.

Meanwhile, Herrmann tries to find the perfect home for his new recliner, and a secret from Gibson’s past comes to light.

Air Date: Wednesday, February 21 (9-10 p.m. ET) on NBC.

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CHICAGO FIRE -- "On The Hook" Episode 12005 -- Pictured: (l-r) Rome Flynn as Gibson, Jonathan Gardner as Teammate -- (Photo by: Adrian S Burrows Sr/NBC)