The gang tries to figure out if a CDC scientist can help cure their troubles or end up revealing their secrets.
A police officer named Rebecca tries to bar Audrey from coming back to town after taking Vince and Dave away. Nathan steps in and then Audrey begins to cough.
Dwight promises to explain everything to the CDC Charlotte. His way of doing this is taking her shooting so the bullet will hit him directly. It's the best way to explain it to her. She thinks the gun malfunctioned.
Duke thinks Dwight is selling him out by telling the CDC lady about the troubles.
Charlotte wants to do anything to believe the Troubles aren't real. Dwight points out that if she's going to help them, she's going to have to believe.
Audrey and Nathan visit a Troubled dude named Kirby. When he touches people, he sees their death. He was sick and his Trouble was triggered. He wants to kill himself.
Duke takes Mara so she can alter the Troubled person so they no longer make people sick. For that Mara needs aether.
Charlotte realizes that anyone with a Trouble is immune, so Dwight wants to find a vaccine. To do that, Charlotte needs something that creates Troubles.
The dancing bear makes a comeback and it makes Audrey wonder if she's real. Nathan says they're in love and nobody can do that.
Audrey has the contagion. That means she's Troubled and they have to either find the person with the contagion or Audrey's Trouble could go off.
Nathan isn't pleased Dwight told Charlotte and doesn't like the direction he's taking with the possible vaccine.
Duke and Mara are trying to get into Dwight's safe when he returns, taking the aether with him.
Vince threatens some dude to try to get the governor to call off the CDC.
Nathan believes it's Pete the doctor causing the epidemic. He starts calculating how many people will be have their Troubles activated by the end of the week -- everyone.
Mara and Duke try to get the aether and when they don't Mara stabs Pete in the neck because Duke waffles on killing him. It forces Duke to kill Pete and absorb his Trouble.
Everyone is alright and Charlotte tells Dwight she'll work with him to stop the Troubles.
Audrey is still sick.
Mara tells Duke she didn't manipulate Duke to kill like Audrey did when she needed someone him to kill someone. She has blood on her hands, as well. She can help him and he can trust her.
Vince finds out that there were no CDC personnel in Haven to call out. Charlotte is a fraud.