A new threat has Duke and Aubrey turning to dangerous allies for help on Haven. 

Nathan is worried about Audrey and her cough. She wants to be happy being separated from Mara, but Nathan cannot help but wonder if losing her immunity to the Troubles wasn't the only problem.

There are no more Troubles Duke can let out without mass casualties. 

Charlotte calls Dwight when she's approached by a guy who suffocated three people. He thinks she has a cure already. For some reason Vince didn't call Dwight with the news on Charlotte. Dwight thinks it's a good sign when and Vince talk because she's keeping their secret.

While questioning witnesses about the latest Trouble, Audrey cannot stop coughing. The boss is totally against Troubled people, making you wonder why she's in Haven.

Mara has escaped. To go grocery shopping. She got popsicles.

Audrey goes to see Charlotte. Charlotte is very convincing about her reasoning for not telling her colleagues. 

When Nathan goes to see Charlotte, he's looking for clues to her actual identity. She ducks him and then answers a call from Vince. That seems improbable, but it gives Nathan a chance to get a sample of her hair from a brush. Ding ding ding ding!

Nathan decides Duke stole the aether. 

Charlotte sees protein markers in Audrey's blood indicating she is deteriorating at a cellular level.

Duke need to let go of a Trouble. Mara tells him to concentrate really hard on not hurting anyone and before letting it go. Regardless, it doesn't come out well. She refuses to leave him.

Charlotte thinks Samantha's Trouble is all about self esteem. When she realizes Audrey fixing the Trouble might make her start deteriorating again, she decides to go along.

Mara wants to save Duke. When she tells him, truthfully, how she feels and kisses him, the Trouble he released disappears.

Audrey tries to save Samantha, but Charlotte wants her to think twice because of what it will do to her. 

Duke and Mara have pretty incredible sex in the boat.

Charlotte tells Dwight she wishes she could do more about what she saw today. When he leaves, she goes to her case and opens a file filled with pictures of Audrey and others at various stages in the last century with a clipping of the Spanish Influenza.