FBI agent Audrey Parker tracks a federal prison escapee who mysteriously dies shortly after reaching his hometown of Haven, Maine.

Audrey sees an old photo in the local newspaper of a woman who could be her mother, she decides to investigate her family origins. Meanwhile, she and Nathan look into an epidemic that threatens the town's livestock and fields.

A dead body of an elderly man is found in a boat floating in the harbor; the man may have been there for at least a few days. The medical examination gives his age as somewhere in his thirties, but he definitely died of old age.

Audrey and Nathan have yet another bizarre case on their hands when a prominent member of the exclusive Haven Hunt Club is found in his car, mauled to death. It has all of the earmarks of a wolf attack and Chief of Police Wournos, who is also a member of the club, is all set to organize a hunting expedition to track and kill the animal. He reluctantly agrees to Audrey's request for 24 hours to investigate further and there are soon two other attacks, one by a bear and the other by a moose. The moose attack is most revealing since it turns out the animal was stuffed leading them to believe that supernatural causes are actually at work. Their investigation turns up two suspects: Landon Taylor, the taxidermist who stuffed the animals in the first place and Jess Minion who has a reputation for being a witch.

People at the clinic Jess works at are dying, and the surviving family members are blaming a shadow creature. Jess is attacked after she makes a discovery that could help Audrey and Nathan solve the mystery. Meanwhile, Jess and Nathan kick their relationship up a notch.

Audrey's birthday party is held at a nearby island resort during a storm. While there, a chameleon takes over the identity of one of the guests, leaving the group to figure out who it now is. At least one of the guests won't be returning to Haven alive.

We learn more about the cracks occurring in Haven.

Haven is beset by biblical plagues. Duke continues looking for information on the tattoo, with a little help from his past. Audrey and Nathan check out Audrey II, and try to figure out what to do about Chief Wuornos.

One of the residents gains a new gift, bringing the fears of the other inhabitants of Haven to life.

Vehicles and equipment malfunction all over town and it's up to Audrey and Nathan to stop the massacre. There's a thin line between love and hate.

Electricity flows freely through town, and Audrey needs to discover how the trouble is related to Haven's new focus of adoration.

Local flora grows more animated by the day and threatens lives on the eve of the town's most highly anticipated wedding.

A bizarre trail of violence is traced back to a man who seems to have spawned an identical copy of himself.

A serial killer is hiding in the woods. Two groups, one led by Nathan, the other by the Rev, search for a kidnapping victim before the killer gets him.

Audrey and Nathan investigate a series of murders - where the bodies are mysteriously mummified.

Dead people return to seek revenge on the living, while Audrey, Nathan and Duke uncover and confront their fates in Haven.

People keep disappearing from Haven. It's up to Audrey to figure out why because they are not only erased from existence but also from everyone's memories.

Audrey is held hostage by a mysterious man who will do anything to learn the whereabouts of the Colorado Kid. At the same time, Nathan and Duke work to solve the mystery of the strange UFO-related occurrences afflicting Haven.

A group of inarticulate half-naked men run amok in Haven and kidnap a small boy. To bring him safely home, his father must first learn the meaning of kindness and find the spirit of humanity.

As ocean-related deaths plague Haven, Audrey races to find a connection between the victims, knowing that, as sure as the tide rises, her time to solve the mystery is running out.

An unstoppable woman stalks Haven's criminals, but her particular brand of justice is neither blind nor fair, and Audrey must stop her before she strikes down every wrongdoer in town--including Duke.

On Halloween night, Audrey, Nathan, Duke and the others are lured to an infamous Haven haunted house - and become trapped inside.

Audrey and Duke unwittingly team up with the killer they've been hunting all season as they track down the only person who can save Nathan's life.

Audrey must race against the clock when she finds every person in Haven has fallen asleep and will die if she can't wake them. The only other conscious person in Haven has lost his memory and can't help her solve the puzzle.

Nathan's 10-year high school reunion is tainted by the deaths of classmates who appear to have reverted to their teenage selves.

Time is up for Audrey Parker as the Hunter meteor shower strikes Haven.

Duke is ejected from the barn to find that six months have passed and a lot has changed in Haven. His sudden appearance suggests that the barn may not have killed Audrey as they thought, and new friend Jennifer has information that supports this conclusion. But can Audrey be found and returned to Haven?

Mysterious deaths seem to be a result of spontaneous combustion. But in Haven all is often not as it seems, and survivor's guilt is a powerful trigger for Troubles.

A series of exsanguinated bodies have the police at a loss to explain the deaths. Everyone is angry at Nathan for shooting Agent Howard and destroying the barn, but it would appear that some are more angry than others.

A string of impossible kidnappings have the town in a panic, and it falls to Nathan and Dwight to find the children before they fall victim to the elements. Duke helps Jennifer learn to hear the voices from The Barn in hopes of finding Audrey.

Some very unusual cases of suicide lead the team to believe there is a possession trouble afoot. But new girl Lexie, who is in fact Audrey, can see there's something more going on than meets the eye.

Knowing the moment of your death isn't as thrilling as one might think, as several Haven residents are soon to learn. Audrey, Nathan and Duke must solve this trouble before the clock runs out.

When a dream trouble goes viral, Haven's finest can't be caught sleeping on the job or they may pay the ultimate price.

Duke decides to leave Haven in the aftermath of dealing with Wade. But his escape is sunk as a trouble causing crushing pressure makes waves across town. The rules of the Troubles as we know them are crumbling - neither the troubled nor untroubled are safe. Amidst this chaos, Audrey and Nathan are forced to confront the truth of what they must do to save the town they love.

When Dwight is kidnapped, Audrey is shocked to discover that not only are the mysterious thugs from the barn behind it, but they have another captive - William. His memory wiped, he doesn't remember her time as Lexie or the barn...and if that's not enough to hinder Audrey's investigation of the thugs' sinister plan, a vicious new trouble sweeps through the town, infecting Dwight, Nathan, and Jennifer with violent delusions. But as Audrey, Duke and William uncover startling truths about the people of Haven, they realize these delusions may not be entirely off-base.

Audrey awakes in a trouble-free Haven to discover that no one remembers her--save for William, who is also immune to the Troubles. But the town's newfound peace is shattered when William reveals his terrible plan and Audrey must fight for the town she loves in a Haven where she's never existed.

A heart-eating monster from folklore attracts a paranormal investigating duo, the Darkside Seekers, to Haven--where they threaten to expose the Troubles to the world. With Audrey in the hospital, Nathan, Duke, and Dwight are left working overtime to protect the town's secrets, only to discover that the Darkside Seekers may be the least of their troubles...

Haven's troubles have never been more deadly than when William activates a trouble in a baby: with every cry, someone dies. Audrey soon learns this is a trouble she's failed to stop before...and with origins she herself had a hand in. As the victims pile up, Jennifer and the Teagues Brothers search for the Heart of Haven, the only place William--and now the Troubles--can be stopped.

As attempts are made to stop William, things only get worse. A search begins to find the fourth key person for opening the gateway. Audrey continues the fight to remain Audrey.

Picking up immediately after the events of last season, Nathan and Duke discover that Audrey's body has been hijacked by Mara. They must thwart her efforts to open another door to the Void while keeping the citizenry of Haven oblivious to the new threat stalking its streets. Their search is complicated when a gory trouble spreads across town and requires their immediate attention.

Nathan and Duke are are coping with the loss of Audrey and Jennifer while Dwight tries to keep Haven together as the chief of police and Mara creates new troubles.

Nathan and Dwight argue over what to do with Mara; Nathan is convinced Audrey is still alive and he wants to save her but Dwight wants Mara to cure the troubles.

Vince and Dave go to North Carolina to find out more from Dave's secret past but searching may cause a new trouble back in Haven; people are switching bodies.

Nathan and Duke are desperate to get Audrey back so they make a dangerous decision before she's gone for good.

Unable to make headway in her investigation, Audrey recruits an old friend to help her communicate with Nathan, who is still trapped on a ghostly plane. Down in North Carolina, Vince and Dave try to escape the hospital before lab tests on Dave's wound reveal its supernatural origins. Meanwhile, Duke realizes he may have found a kindred spirit in a former foe.

As Audrey's health deteriorates, Nathan races to find a cure for the mysterious illness before it is too late. Dwight struggles to contain the contagion but faces interference from Dr. Cross, who has a few secrets up her sleeve as well. Meanwhile, Duke realizes that some old loyalties may be shifting and decides he needs to take matters into his own hands to protect Haven.

As Duke's volatility threatens to unleash unprecedented chaos on Haven, the pressure is on for the CDC doctor to develop a cure for the troubles. Meanwhile, Audrey's symptoms worsen and she must put on a brave face as she and Nathan tackle a psychological trouble, but Nathan grows increasingly worried about her health.

Charlotte makes progress towards developing a cure for the troubles, but it might be too late as Duke's condition takes a turn for the worse. Meanwhile, realizing their objectives may no longer line up, Haven's heroes must reassess where their true loyalties lie.

Mara's true intentions are revealed.

New Troubles have infected over half the town and that's the good news.

Nathan returns to the school without Kira and gives her fiancee Tony the sad news that Kira is dead. Haven catch a break - the lights are back on, so they've eliminated the Darkness Trouble but now they've got to quell an angry mob accusing Nathan of murder.

The citizens of Haven put Nathan on trial for his life, and it's up to Dwight and Charlotte to clear his name. Hoping to buy them time, the brothers Teagues moderate the trial as Audrey continues her quest to solve the darkness trouble.

Charlotte and Audrey start on a plan to stop the troubles.

Nathan tries to track down a terrifying killer; and Duke has a vision of Haven's future.

Nathan and Vince travel back to 1983 to learn the secret of how Croatoan has found a way into Haven. Meanwhile, Duke finds his life on the line when he is apprehended by a mysterious foe.

After entering the Void Nathan encounters an old enemy; Audrey and Duke must stop a new troubled person who is looking for revenge.

Nathan is still stuck in the void with William, Audrey and Duke must convince Haley to open the thinny before its too late for Nathan. Dave confronts Croatoan in his mind.

Audrey and Nathan try to regain control of the police station while a mysterious killer leaves a wake of bodies.

Nathan and Dwight race to rescue Audrey from Croatoan, but the consequences of Duke's dark destiny wreak havoc on their plans. Meanwhile, Vince contemplates an unusual sacrifice.

Haven's heroes struggle to rebuild the Barn in the face of mounting obstacles. Dwight is tempted by a surprise gift and Nathan must consider a devastating sacrifice.

Nathan struggles to return to Haven; Dwight reconsiders his future; Audrey realizes the way she can save the town from Croatoan.

Nathan and Dwight race to rescue Audrey from Croatoan, but the consequences of Duke's dark destiny wreak havoc on their plans. Meanwhile, Vince contemplates an unusual sacrifice.

Vince and Dave go to North Carolina to find out more from Dave's secret past but searching may cause a new trouble back in Haven; people are switching bodies.

Nathan and Vince travel back to 1983 to learn the secret of how Croatoan has found a way into Haven. Meanwhile, Duke finds his life on the line when he is apprehended by a mysterious foe.

As Audrey's health deteriorates, Nathan races to find a cure for the mysterious illness before it is too late. Dwight struggles to contain the contagion but faces interference from Dr. Cross, who has a few secrets up her sleeve as well. Meanwhile, Duke realizes that some old loyalties may be shifting and decides he needs to take matters into his own hands to protect Haven.

Audrey and Duke unwittingly team up with the killer they've been hunting all season as they track down the only person who can save Nathan's life.

After entering the Void Nathan encounters an old enemy; Audrey and Duke must stop a new troubled person who is looking for revenge.

Charlotte makes progress towards developing a cure for the troubles, but it might be too late as Duke's condition takes a turn for the worse. Meanwhile, realizing their objectives may no longer line up, Haven's heroes must reassess where their true loyalties lie.

As Duke's volatility threatens to unleash unprecedented chaos on Haven, the pressure is on for the CDC doctor to develop a cure for the troubles. Meanwhile, Audrey's symptoms worsen and she must put on a brave face as she and Nathan tackle a psychological trouble, but Nathan grows increasingly worried about her health.

Audrey and Nathan try to regain control of the police station while a mysterious killer leaves a wake of bodies.

Nathan and Duke are desperate to get Audrey back so they make a dangerous decision before she's gone for good.