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.
Dwight tries to coordinate efforts to suppress the new outbreak of Troubles, while Dave and Vince learn the truth about Dave's visions. Meanwhile, Nathan and Duke try to calm a Troubled girl, and Audrey and Charlotte search for the source of the fog wall.
The no marks killer strikes again, and Vince and Dwight cover up the murder. Meanwhile, a darkness-based Trouble is killing people, and Nathan takes a team to the power plant to restore power before it's too late. In Halifax, Duke meets the daughter of an old friend who is eager to learn if she is Troubled.
Nathan is innocent of Kira's death, but he can't reveal her location without giving away the aether cache. While Charlotte and Dwight go to rescue the woman, Nathan stands trial to buy them the time that they need. Meanwhile, the darkness closes in as Audrey discovers the Troubled person responsible for the deaths.
Audrey is trapped in the Sandman's world and forced him to marry him, and has no memory of her real life. Meanwhile, Duke meets Darkside Seeker Seth in Halifax and discovers that he doesn't remember Haven or the Troubles.
While Charlotte and Audrey try to harvest the hidden aether, they discover that a new Trouble is targeting them along with Nathan and Dwight. Meanwhile, Duke and Seth travel to North Carolina and make contact with the man who can supposedly cast out Troubles.
Things seem too good to be true when Nathan and Audrey stumble across a Trouble that can resurrect the dead. They soon bring back Charlotte, but discover that resurrection comes with a terrible price. Meanwhile, Dave and Vince go hunting for Croatoan.
Nathan and Vince travel back to 1983 to try to find the Troubled person who created the thinny that Croatoan used to kill the Colorado Kid. Meanwhile, mysterious men capture Duke so that he can meet with their employer.
Duke returns to Haven with Hallie, who creates a thinny so that Nathan can recover the controller... and meet a familiar face. Meanwhile, Vince and Dwight try to find a troubled person whose ability can break Croatoan free from Dave.
William offers to use aether to give Nathan a new Trouble so that they can both escape the Void before it's too late. Meanwhile, Duke tries to convince a dying Hallie to reopen the thinny, and Dave confronts Croatoan inside of his mind.
Nathan and the others take Audrey to the police station to keep her safe. However, Croatoan sends his agent in to capture her and bring his daughter to him. Meanwhile, Vince deals with the death of his brother, and dispatcher Laverne gains a new Trouble.
After Nathan and Dwight capture Duke, Nathan tries to reach his friend through Croatoan's control and get him to reveal where Audrey is. Meanwhile, Croatoan explains to a captive Audrey why she is so important to his plans for the people of Haven.
Audrey and the others try to use Vickie's Trouble to restore the aether core, but Croatoan sends Duke to stop them. Meanwhile, Dwight must choose whether to help Croatoan and keep his daughter Lizzie... or lose her forever.
While Nathan tries to find his way back to Haven, the Guard hunt down Dwight to stop him from giving the crystal to Croatoan. However, the group's plan to trap Croatoan in the new Barn fails, forcing Audrey to take desperate measures.