Chicago Fire frames its finale with an incident that has Herrmann (David Eigenberg) wondering, “What the hell was that?” as the ground shifts beneath him, Kidd (Miranda Rae Mayo), and others. And then the episode goes back a few days before. So, how does it end? Well, let’s just say 51 could very well be about to lose a major member. Warning! Spoilers for the Chicago Fire Season 14 finale ahead!

First, 72 hours earlier, Herrmann, after “venting,” as he puts it, about the construction on their new house, surprises Cindy (Robyn Coffin) by getting down on one knee. “Are you having a heart attack right now?” she asks. No, he’s proposing, wanting to renew their vows after all they’ve been through and to celebrate the fact that, after 32 years of marriage, they’re still in love. It’s sweet. It has us worried.

Back on the incident, Kidd and Herrmann realize the roof is about to collapse and they shouldn’t vent. It’s a rush to get back to the ladder. Kidd’s the last one on the roof.

And 58 hours before that, Severide (Taylor Kinney) is pondering his future while in bed with Kidd. Does he take the OFI job, which some would say is his destiny? Or does he stay at 51, his home? He has three days to make his decision, and he hasn’t told anyone about the official offer. Also with a decision to make? Vasquez (Brandon Larracuente), whose father insists he meet with PD’s training commander.

After catching up with the firefighters at the incident, 36 hours earlier, Severide goes to a meeting at HQ, surprised to find Pascal (Dermot Mulroney) waiting for him. Pascal was brought in by the fire rescue division to ask him not to take the OFI job. He’s not back at CFD — he doesn’t know what the department has in store for him — but he did leave Severide in the leadership position at 51. Severide assures him that OFI is the only place he’d consider going, considering his and his father’s history there. But wherever he ends up, Pascal tells him, he’ll be a captain; his promotion went through. He’s also sticking around. As he’s debating what he’s going to do, Isaiah stops by for a visit.

As Cindy comes up with a theme for the vow renewal, while working with Violet (Hanako Greensmith) and Novak (Jocelyn Hudon) — gratitude — Mouch (Christian Stolte) learns that the publisher is interested in his book, but not Brothers in Arms. They want the first one, the one without Herrmann, or so he thinks. During a meeting, he finds out they actually want Sheets on Fire, which he’d written under a pen name nine years ago, because romance is very marketable. Between this, what’s going on at the incident, and the vow renewal plans, we’re even more worried about Herrmann.

After briefly catching up with the firefighters at the incident again — it’s really smoky, and it looks like squad comes across something… 18 hours earlier, Cruz (Joe Minoso) and Chloe (Kristen Gutoskie) find out they’re having twins!

Violet, while helping set up for the vow renewal at Molly’s, hangs a photo of herself and Hawkins, reflecting on how she still misses him every day. She suggests Novak do something if she has feelings for Vasquez and don’t risk waiting. Vasquez, meanwhile, gets an offer to pick up where he left off at the police academy. He could be an officer in less than a month, and when he does a training drill, he proves he’s a natural.

Back in the incident, Kidd checks on Squad and Engine over the radio. They’re inside, but OK, and Severide thinks they’re nearing the fire.

Fourteen hours before that, Severide and Kidd learn that Isaiah’s not just visiting; his mom can’t take care of him anymore, and he would rather live with them than stay in Cleveland. They table it for the vow renewal, where Novak admits to Vasquez it would be more than just fun between them, and Kidd admits to Severide than OFI wouldn’t be the worst choice, especially with Isaiah possibly coming back (and he’d mentioned it’s safer).

The vows have us even more worried about Herrmann. “You’re a force of nature. When you set your mind out to do something, you get it done,” he tells Cindy. “I just want to say that force of yours, that’s who you are, and that is the reason we are going to get to rebuild our house where we wanted to, where it was, and it’s also the reason no matter where we end up, we will always be home.” When it’s her turn, she says, “It’s not easy to watch the person you love leave the house every day and put their life on the line, even on the days you’re a jerk. The truth is, Christopher, you don’t always make our lives easier, but you always make them better.” She then toasts to, “A new house, but thankfully the same family, all of you.” Seriously, uh-oh.

Thirty minutes before the incident, Mouch tells Herrmann about the book, but his best friend doesn’t care. After all, he’s thinking about the future and how much Cindy worries when he’s on the job and he could use the commission for his retirement. Plus, he points out, Mouch could use the money from the romance novel to publish Brothers in Arms himself.

Then comes the call that we’ve been seeing bits of all episode, with Pascal riding along after stopping by 51 to find out what Severide decided (and he did make up his mind). But the finale and season ends with Truck heading down the ladder when Squad and Engine find the fire inside — and then a fireball erupts and engulfs the ladder with Truck on it while the others are trapped inside and we hear a Mayday call. Uh-oh!

Do you think Chicago Fire is about to kill someone off like it did to kick off Season 3 after a similar cliffhanger? (The glimpses of Herrmann, Mouch, and Cruz’s wives, as well as Isaiah certainly have us worried tragedy could be coming for one of them!) If so, who? Let us know in the comments section below.