Nathan and Duke deal with the loss of Audrey... and the usurpation of her body by Mara, the evil being partially responsible for the creation of Haven's Troubles.
-- Forever Goodnight
Nathan and Dwight realize the source of the new Trouble besieging Haven's residents, and take steps to stop it. Meanwhile, Mara recruits Vickie to break through the thinny.
Rather than hand Mara over to Dwight and put her life at risk, Nathan takes her into hiding. Meanwhile, a friend of Duke's suffers from a Trouble and he realizes that Mara may be his only chance of saving her.
Songs: Jody Brian Quartet -- Drifting Home to You
As Nathan and Duke try to convince Dwight that Audrey still exists inside of Mara, a series of strange and lethal phenomena hit the area. Meanwhile, Vince and Dave undergo counseling to learn what happened in the cave.
Vince goes behind David's back to travel to North Carolina and investigate the circumstances behind his adoption. However, the two brothers suddenly discover that they've switched bodies. Meanwhile, Nathan comes up with a new plan to bring Audrey back even though Mara claims to have killed her.
Duke's body threatens to explode from the Troubles within, and Nathan is unable to focus enough to release him. To save him and Duke, they have to reunite the brothers and have them undo their body-switching Trouble.
Nathan disappears along with several other Haven residents, and Audrey and Duke are unaware that their friend has been turned into a ghost. Meanwhile, the Guard still believes that Audrey is Mara and make plans to kill her.
Trapped in intangible form, Nathan attempts to find a way to restore his body with Duke and Audrey's help. However, one of the other "phantoms" plans to kill rather than face returning to the real world.
As a CDC doctor arrives in Haven to check on Dave's infection, a mysterious disease sweeps through Haven, targeting Troubled individuals and threatening to reveal the town's secret to the world.
Charlotte races against time to find a cure for the disease activating the Troubled's curses. Meanwhile, Nathan finds the source of the disease, but is unable to stop the person responsible. And Duke releases Mara and they seek out the aether samples.
While Audrey's health deteriorates, a new Trouble strikes Haven. Meanwhile, Duke's internal Troubles threatening to burst out and only Mara can help him... but will she?
Audrey and Vince confirm that Charlotte isn't who she says she is. Meanwhile, both Nathan and Duke try to find the missing Mara, and Duke discovers that his Trouble has mutated yet again.
Charlotte reveals her connection to Mara and to Audrey, while Mara primes Duke to explode if she doesn't get her way. Meanwhile, Vince convinces Dave to lead him to Croatoan.