Chicago Fire preview: What to expect in season 12, episode 5

Here's a look inside the tense new episode of the firefighting drama.

CHICAGO FIRE -- "On The Hook" Episode 12005 -- Pictured: (l-r) Hanako Greensmith as Violet Mikami, Miranda Rae Mayo as Stella Kidd, Christian Stolte as Randy "Mouch" McHolland, Kara Killmer as Sylvie Brett -- (Photo by: Adrian S Burrows Sr/NBC)
CHICAGO FIRE -- "On The Hook" Episode 12005 -- Pictured: (l-r) Hanako Greensmith as Violet Mikami, Miranda Rae Mayo as Stella Kidd, Christian Stolte as Randy "Mouch" McHolland, Kara Killmer as Sylvie Brett -- (Photo by: Adrian S Burrows Sr/NBC) /
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Chicago Fire took off a week off for Valentine’s Day, but the good news is we have a look at what to expect in Chicago Fire season 12, episode 5. The previous promo it very clear that Chicago Fire season 12, episode 5 will air on Wednesday, Feb. 21.

Chicago Fire spoilers: 12x05 promo

The promo gives us a look at the main story for the night. It looks like Brett’s job is on the line just ahead of her getting married and leaving the firehouse. When the defibrillator malfunctions and puts a life on the line, Brett and Violet need to get answers. The problem is that this could be human error.

Boden is serious as he runs through what the investigation could find. Brett knows that if it is human error, she is the one on the hook. This could be her career.

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Chicago Fire spoilers: 12x05 synopsis

Chicago Fire - Season 12
CHICAGO FIRE -- "On The Hook" Episode 12005 -- Pictured: (l-r) Kara Killmer as Sylvie Brett, Isabel Lee Roden as Female Patient, Hanako Greensmith as Violet Mikami -- (Photo by: Adrian S Burrows Sr/NBC) /

While the synopsis puts some focus on this storyline, it’s not the only one for the episode. We also get a look at two other characters who will get some more attention.

The first is Herrmann, who gets a new recliner. He’s looking for the perfect spot for his recliner, which is sure to be the comedic relief that the episode is going to need.

Related: Chicago Fire promo photos shed light on Severide return

Gibson will also get some time as we learn more about him. It’s clear that he has a past that he doesn’t want others to know about. Despite being a successful boxer, he didn’t want anyone at Firehouse 51 knowing about that. It came out when a civilian recognized him. That’s led to some questions about why he would hide something like that.

Could he just want to keep his private life private until he gets to know people? Is there something more to his past? It looks like something is about to come out.

"After their defibrillator malfunctions on a call, Brett and Violet search for answers; Herrmann tries to find the perfect home for his new recliner; a secret from Gibson's past comes to light."

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Chicago Fire returns on Wednesday, Feb. 21 at 9/8c on NBC.