- Okay. What did you find?
- That's where the fire started.
- And that's what we found there.
- Electrical fire?
- That's a timing device. You take a brown paper bag,
and you fill it with an oxidizer--
kitty litter or chlorine.
Then you take a light bulb and you fill it with fuel--
gasoline, cooking oil, whatever.
And you see the drill hole? That's where they filled it.
- You put the light bulb in the bag.
- Right. And now you've got a simple incendiary device.
Drop the bag on the floor, you step on the bulb with your heel,
and just walk away.
- A chemical reaction would start right away.
Instructions are easy to find with a quick Internet search.
[dramatic music]
♪
[footsteps approaching]
- Kelly, hey. - Huh?
- There is someone to see you on the upfloor.
- Thanks. - Mm-hmm.
- I can't imagine what the last 24 hours have been like.
Are you okay?
- You came all the way up here to check on me?
- Sort of.
I was actually already packing up my car
when I heard about the Kimble fire.
The thing is is that, um,
last week, when I was heading home from work,
it just suddenly hit me.
You are not the only one who gets to decide
when it's "someday,"
because "someday" was actually my idea,
so I should be the one who gets to decide.
- Yeah. Sure--
- And I get why you wanted to stay in Chicago,
'cause I mean, it's the same reason
I went back to Springfield--
it's home.
But then I...
heard about this opening
for a pediatric nurse at Med.
- You're the one who took the job at Med?
- Yeah. - [laughs]
- Maggie told me you already asked about it for me, though.
Actually, I wasn't supposed to tell you that,
so if you tell her, she will kill me.
[soft music]
♪
- "There were doors all around the hall,
"but they were all locked, and when Alice had been
"all the way down one side and up the other,
"trying every door,
"she walked sadly down the middle,
"wondering how she was ever going to get out again.
"Suddenly, she came upon a little three-legged table,
"all made of solid glass.
There was nothing on it but a tiny golden key."
- "Alice in Wonderland."
- Yeah. Thanks.
She was Alice for Halloween every year until she was eight.
- Yeah?
- Excuse me. You know where Lexi Olinsky's room is?
- It's right here.
- Sergeant. - Chief.
- OFI has a conclusion. - And?
- That fire was intentionally set.
This was mass murder.
[alarm blaring] - Dr. Halstead!
- Chief. Sarge.
[monitors beeping, alarm blaring]
- Lexi. What's going on?
Do something.
- Hey, watch out. O2 sats are tanking.
She's unable to oxygenate.
- Lexi! Hey, Lexi! Lexi? - Al, come here. Come here.
- Do something. - Al? Hey! Step out.
- Do something, man. Lexi!
- Come on. - Lexi!
- Get off me! - Al. Al.
- Please!
- Get another blood gas, drop her tidal volume to 300,
increase her rate to 25, and up the PEEP to 10.
Start paralytics. 50 of Atricurium.
- Lexi?
- It's okay.
- Doc. - Close that curtain.
- Doc, please.