About the inhabitants of a small Iowa town suddenly plagued by insanity and then death after a mysterious toxin contaminates their water supply.

David Dutton: [In the car wash, to the Deputy firing his shotgun out of the car window] RUSSELL!
Russell Clank: I saw a movement!
David Dutton: Everything is fuckin' moving!
David Dutton: Don't ask me why I can't leave without my wife and I won't ask you why you can.
Russell Clank: Hoo-fucking-yah.
Russell Clank: Fuck you for what you did.
David Dutton: Do you wanna give up? You wanna sit here and die, tell me, and I will sit here and die with you.
[last lines]
Newscaster: We want to update you on late-breaking news. A massive fire in Ogden Marsh continues to rage, and high winds are preventing fire teams from containing the deadly blaze. Now, information is still coming in, but what we currently know: An explosion rocked the Dakon Petrol chemical plant early this morning, with eyewitness reports of a 400-foot fireball that lit up the sky. We also have second reports of a second explosion at a nearby truck fueling station.
[breaking up]
Newscaster: A perimeter has been set in an effort to contain the flames, and civilians are not being permitted into that area.
TV Screen: [SIGNAL LOST]
Bill Farnum: She worries too much. I'm fine. I'm just tired.
Judy Dutton: So, what are you doing for the weekend?
Bill Farnum: She worries too much. I'm fine. I'm just tired.
Becca Darling: This is really happening...
Judy Dutton: It's gonna be all right, we're gonna be okay.
Becca Darling: You don't really believe that, do you?
Russell Clank: I will fuckin' shoot you where you stand.
Russell Clank: One, two, three. That's how many times I've saved your life. Now walk out where I can see you, go on, move!
Russell Clank: I'm not right, am I?
David Dutton: You know what?
Russell Clank: What?
David Dutton: We're in trouble.
Russell Clank: My name's Deputy Russell Clank, the Pierce County Sheriff's Department. It's okay, it's okay; I'm not sick. Oh, shit... it's okay. It's okay...
[first lines]
Becca Darling: Um, Dr. Dutton, my aunt's in town.
Judy Dutton: Um hmm...
Becca Darling: And she's sick too.
Judy Dutton: Phew, I'm going to need you to stay late tonight. You know, you should probably text your aunt - Scotty - and tell him you can't make it to the baseball game tonight.
Russell Clank: Is he dead?
David Dutton: Well if he is, he won't mind waiting.