While Nathan tries to return to Haven after Croatoan sends him away, Dwight defies the Guard to get the crystal back to Croatoan so that he can begin his experiments with Audrey at his side.
Six months after the Barn disappears, Duke reappears in Boston. He meets a woman who claims that she can hear the voices from the Barn, and takes her back to Haven to try and find Audrey. The Troubles haven't ended, and the townspeople blame Nathan, who is living as drifter because the Guard wants him dead. As they deal with a Troubled person whose ability has come back, Audrey resurfaces... as a bartender named Lexie.moreless
Croatoan sends Duke to attack the group when they come up with a way to restore the aether core. Meanwhile, Dwight and Nathan both face terrible choices when Croatoan offers them what they've always wanted.
Dave and Vince try to track down Croatoan, while Dwight, Audrey, and Nathan convince a Troubled woman to bring back Charlotte from the dead. In North Carolina, Duke has a vision of Haven's future.
Nathan gets a new partner as he tries to track down a Troubled person who can change its victims' personalities.
Audrey and Nathan go after a Troubled who can enter people's dreams, while Duke hunts down his brother.
Audrey, Duke, and Tommy must find a wounded Noelle before sunset or lose their chance of bringing back Nathan from the dead. However, one of them doesn't want Noelle to succeed.
Nathan and Vince use a Trouble to travel back in time to 1983 to try and find out how Croatoan was able to kill the Colorado Kid. However, Vince tries to stop the murder, while Nathan meets Lucy. Meanwhile, mysterious men in suits capture Duke and hold him captive.
In the aftermath of Audrey's abduction and Nathan's struggle with Duke, alien phenomena plague Haven and a innkeeper's mother goes missing.
When Audrey won't accept that she helped create the Troubles, William unleashes a new Trouble-related curse on Haven.
Audrey finds herself trapped by time when a repeating cycle of events involving a runaway car lead to the deaths of her loved ones.
While Audrey draws ever closer to losing herself, the others try to open the door and send William back.
One of the Troubled sends Duke back in time to Haven in the 1950s and Audrey and Nathan must rescue their friend before he changes the past... and eliminates their present. When Nathan gets sent back as well, Audrey finds herself trapped in a new reality where Reverend Driscoll's men control the town and hunt the Troubled.moreless
While the mystery of Lexie continues, she helps Nathan and Duke try to find a Troubled person who can petrify their victims.
While Duke tries to convince Hallie to reopen the thinny, Nathan tries to escape from the Void where he and William are trapped. Meanwhile, Dave must consider making the ultimate sacrifice to stop Croatoan.
The day is here, the barn has arrived. But Haven has still some surprises left. Some things come to a head, answers are given and new questions arise. The departure isn't going as planned and the Hunter storm shows no sign of letting up until Haven is wiped from the face of the earth.moreless
A string of murders at a high school reunion indicates the presence of a Troubled individual taking out their teenage frustrations.
While Hallie opens a thinny so that Nathan can enter the Void, one of the new Troubled confronts Duke over what he did to her. Meanwhile, Vince and Dwight discover that Croatoan is killing the Troubled that might break his link to Dave.
While investigating a drowning, Nathan and Audrey check out a community where a child has gone missing and discover that they hide a Troubled secret. Meanwhile, Duke recruits Evi to help him find out what Driscoll knows about the death of his father.
Audrey and Nathan help a Troubled girl who the Guard wants for their own purposes. When Jordan reveals her true colors, the officers learn the truth about the Barn and Audrey's destiny... and who the real Bolt Gun Killer is.
After Duke releases a new wave of Troubles, Nathan and Dwight try to help the victims--and their victims--while Audrey and Charlotte look for the man responsible for the fog wall. Meanwhile, Gloria and Vince get Dave drunk in hopes that it will trigger another Croatoan vision.
Nathan and the Guard manage to capture Duke, and Nathan tries to get through to his friend. Meanwhile, Croatoan explains his plan to Audrey, and insists that he'll give the people of Haven everything that they've ever wanted... if Audrey cooperates with him.
As the time of her 27-year disappearance draws near, Audrey wakes up one morning and discovers that everyone else in Haven has gone into a coma... except for one man.
The citizens of Haven gather at the police station to protect Audrey from Croatoan, but a traitor from within threatens their plans.
Duke makes a deal with Mara so he won't destroy Haven. However, Nathan needs Mara to cure Audrey. Meanwhile, Charlotte reveals the secret of Mara and Audrey's existence, and Dave and Vince try to find out the source of Dave's visions.
Audrey gets a lead on the location of the Colorado Kid and heads west with Duke to investigate. Meanwhile, Tommy and Nathan investigate several Troubled incidents involving the resurrection of the dead.
Victims in Haven are found with diseased organs next to their bodies... and their own healthy organs missing. While Nathan and Audrey investigate, they have to cope with a Boston police detective following upon a similar murder. Meanwhile, Duke must decide if he will accept his destiny, while Audrey decides what to do about her relationship with Nathan giving her coming disappearance.moreless
Haven is plagued by a mysterious series of ocean-related deaths... that take place on dry land. Meanwhile, the Teagues investigate Tommy's background, Duke insists on helping Nathan and Audrey with their investigation, and Nathan meets with one of the tattooed people.
While the townspeople take refuge in the Haven school, a new Trouble stalks them from the darkness. Audrey learns how Dwight is keeping order, while Nathan takes a team on a desperate mission to restore power to the town. Meanwhile, Duke settles into a normal life but discovers that the Troubles have followed him.moreless
Haven's dead rise from their graves to reveal the town's secrets... and those of Audrey, Nathan, and Duke.
With Nathan's help, Audrey finally locates Lucy Ripley and goes to confront her. Meanwhile, Duke and Dwight join forces to discover what Duke's father Simon left for his son.
A female vigilante appears in Haven and starts attacking criminals--including Duke. Meanwhile, Audrey tries to get a lead on the bolt-gun killer and Nathan vows to do anything to infiltrate the Guard.
A group of unknown naked people go on a rampage in Haven and Audrey and Nathan try to figure out which Troubled individual is responsible... and how to stop them. Meanwhile, Duke learns the secret of the Hunter.
While FBI agent Audrey pursues the investigation into the fake Agent Howard, Nathan and Audrey deal with an outbreak of machines with minds of their own... and a desire to kill.
Lexie's attackers from the Bar reveal themselves and their hostage--William--in Haven. To stop them, Audrey must rescue William if she hopes to find out the source of the new Troubles plaguing the town.
Audrey and Duke invite Chris and Evi along to a wedding at an isolated home... and discover that one of the guests is apparently a Troubled individual with the ability to control plant life.
Mara, occupying Audrey's body, goes on a rampage to find a way back to her own world. Meanwhile, a new Trouble with an old history strikes the residents of Haven, and Duke suspects that he might be the one responsible.
While Dave and Vince travel to North Carolina to explore the circumstances of Dave's adoption, a new Trouble strikes Haven. Meanwhile, Nathan takes a different approach to try and bring Audrey back.
When a Troubled immolates the citizens of Haven, Nathan and Duke have to take time off from their search for Audrey to deal with it.
While Duke tries to convince Wade to leave Haven, Nathan and Dwight investigate murders where the victims are drained of their blood.
After the newest Troubled person switches their minds, Duke and Nathan try to use the circumstance to their advantage to fool Mara. she soon realizes what they're up to, forcing them to risk everything on one last, desperate plan. Meanwhile, Dave and Vince learn more about the circumstances of Dave's adoption in North Carolina.moreless
The town's mysterious killer uses a Trouble to target Nathan, Dwight, Audrey, and Charlotte for death... and to stop them from recreating the Barn. Meanwhile, Duke and Seth search for the mysterious man who can drive the black tar from the bodies of sinners.
Nathan secretly tells Dwight and Audrey that Kira is trapped with William's hidden cache of aether, and they can't risk leading the townspeople to it. While Dwight and Charlotte go to free the girl, Nathan stands trial to stall for time until they can come back and prove that Kira is still alive. Meanwhile, Audrey recruits a Troubled man, Grayson, to help her deal with the darkness trouble.moreless
Audrey and Nathan take a search party into the woods to find a missing boy whose disappearance may be connected to the Troubles, and receive some unwanted help from Driscoll.
A Troubled individual ends up creating a new reality where the Troubles never existed. Audrey is the only one who is immune and tries to convince Duke and Nathan that she's not insane. However, things become complicated when William, who has a similar immunity and is also trapped, tries to find a way to reverse the situation.moreless
The Sandman puts Audrey in a coma and plans to force her to commit to him forever through a wedding ceremony in his dream world. In Massachusetts, Seth investigates reports of a girl phasing through a wall and finds Duke... and has no memory of Duke or Haven.
An ocean-related Trouble brings the crushing pressure of the depths to Haven, while Audrey and Nathan discover that the residents' Troubles are mutating.
Nathan and Audrey are finally reunited but at a cost. However, their reunion is short-lived when Nathan is seemingly killed by a localized nuclear blast... only to find himself transformed into a ghost.
Children in Haven begin disappearing and the cause may be related to an ancient legend. Meanwhile, Duke and Jennifer try to pinpoint Audrey's location.
Audrey is the only one who realizes that there are Christmas decorations in July that no one else finds unusual. The out-of-season decorations are only a prelude to the bizarre bisection of a surfer and a series of escalating disappearances of people who no one can remember except Audrey.
A banker hides a dark secret that connects him to a killer hiding in Haven. Meanwhile, Duke helps a young runaway and Nathan discovers that his job is at risk.
As Duke threatens to explode from the Troubles that he contains, he turns to the only person who can help him: Mara. Meanwhile, audrey tries to deal with a new Trouble while her illness grows ever more debilitating.
While Dwight tries to convince Charlotte that she shouldn't call in the army, Nathan and Audrey race to find a cure for the illness striking the Troubled people in Haven. Meanwhile, Duke frees Mara.
Audrey calls in help from the Darkside Seekers to find a way to communicate with Nathan. However, to learn what they need to bring him back, Duke has to agree to an unusual deal with Mara. Meanwhile, the hospital takes a sample of the infection on Dave's leg, and the analysis may endanger Haven's secrets.moreless
When a Troubled individual unleashes a rotting plague inside the police station, the new Chief orders a quarantine... trapping Audrey and the others inside. Meanwhile, Duke confronts Evi about her betrayal of him.
Audrey and the others investigate a Troubled event which takes them to a supposedly haunted house... which traps them inside.
Dwight befriends Charlotte Cross, the CDC doctor sent to Haven to investigate Dave's biopsy sample. But dancing bears and a mysterious infection threaten to expose the town's secrets to the world. Meanwhile, Mara convinces Duke that his friends are turning against him.
Mara offers to cure the Troubles in return for Dwight's help recovering the aether that William hid. Meanwhile, Duke is plagued by a new Trouble, while Vince and Dave seek help to recover the memories they lost in the cave.
While Duke's new Trouble runs rampant, Nathan sets out to capture Mara and turn her over the Guard in the hope that they can make her undo the Troubles. Meanwhile, Vince and Dwight disagree over the leadership of the Guard as Vince tries to deal with Dave's injuries.
When someone abducts Mara, Duke goes looking for her and crosses paths with Nathan. Meanwhile, Vince and Audrey try to find the proof they need to convince Dwight that Charlotte is not who she claims to be.
The Darkside Seekers' presence in Haven threatens to reveal the existence of the Troubles to the world.
Nathan abducts Mara on his own so that he can bring Audrey back out... and keep the Guard from killing Mara. Meanwhile, Duke's friend suffers from a fatal Trouble and he needs Mara to cure her... and himself, as the Troubles within eat away at him.