FBI agent Audrey Parker travels to the town of Haven to investigate the death of an escaped prisoner who fled to his hometown. She soon discovers the man's death is merely the tip of a very large iceberg of supernatural phenomena.

Haven is stricken by a mysterious plague when animals and plants alike are destroyed by exposure to hydrochloric acid with no discernible source.

A series of fatal animal attacks lead Audrey and Nathan to investigate a local woman who supports animal rights. However, they soon discover that while she may not be Troubled, the person responsible is... and Chief Wournos is the next target.

Audrey remains in Haven to investigate her mother's connection to the Colorado Kid, but ends up working with Nathan to determine the cause of a mysterious series of incidents that involve butterflies and otherworldly phenomena centered on a angry reverend, his passive daughter, and her foster son.

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.

Young men in Haven start aging at an accelerated rate, and Audrey and Nathan attempt to find the source.

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.

Naked savages wander the streets of Haven. While Nathan and Audrey try to determine who they are and where they've come from, Duke convinces the Teagues to let him see the old newspapers and determine who the mysterious "Hunter" is and how he's connected to Audrey.

Duke’s roiling troubles and a new threat to Audrey force them each to seek the help of potentially dangerous allies.

Nathan and Audrey investigate a series of murders, but the prime suspect insists that she's trying to stop the real killer. Meanwhile, in the aftermath of Duke's revelation, Audrey continues to investigate the Colorado Kid mystery involving her mother.

A single day keeps repeating for Audrey, who finds a deadly accident linked to the phenomenon.

Audrey and Nathan encounter a bizarre series of deaths suggesting a serial killer, with a unique “trouble”, is at work in Haven. Meanwhile, a Boston cop tries linking the town's latest body to similar cases.

Audrey and Nathan investigate a series of strange incidents where the only common factor is water. Meanwhile, Duke insists on tailing along on the officers' investigation, while the Teagues do some digging on Tommy's background.

The Seekers follow a monster to Haven; their presence threatens to reveal the town's troubles to the entire world.

William is determined to convince Audrey of the truth behind her origins; a seemingly unstoppable curse is unleashed.

Audrey and Nathan learn of a ghost story that wanders the Haven clinic and takes the lives of sick people before their time.

Audrey joins in a friendly game of poker aboard Duke's ship, but the two new players soon lock everyone up and try to find a box that Duke is smuggling. Meanwhile, Audrey's boss arrives in town and demands answers.

Audrey and Nathan investigate when a gust of wind seemingly throws a woman into a wall following an argument, and the FBI agent suspects some children may have telekinetic powers.

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.

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 vigilante stalks Haven's criminals, rendering poetic justice. Meanwhile, Nathan grows closer to Jordan as he attempts to infiltrate the Guard, and Audrey learns more about the bolt-gun killer that is stalking her.

While helping a little girl whose "trouble" is the ability to make people do what she wants Audrey also gathers clues to the identity of the Bolt Gun Killer.

Duke is ejected from the barn and rescued by a young woman; Audrey is missing and the Troubles are worse than ever.

As charred bodies are uncovered around Haven, Duke must refocus Nathan to solve the case at hand.

Nathan and Dwight race to search for the trouble behind a series of exsanguinated corpses; Duke must convince his half-brother to leave Haven before he learns the truth of the Crocker family trouble.