In the aftermath of Chief Wournos' death, Nathan and Audrey deal with a woman claiming to be Audrey, the ten Plagues of Egypt, and Reverend Driscoll's attempts to take control of Haven.

A girl who can project a person's worse fear sets off a panic in Haven. As Nathan and Audrey investigate, they discover that another Troubled person is involved, one who needs the woman's affliction... and Nathan's. Meanwhile, Audrey Two tries to track down Audrey's Agent Howard.

Machines come to life and start killing people in Haven. While Audrey and Nathan try to deal with the new crisis, Audrey Two investigates the mystery of Agent Howard.

A Troubled individual with electrical powers threatens the entire town. Meanwhile, Duke tries to find the secret that will let him ward off his tattooed killer.

The children of two feuding families attempt to marry. However, their wedding is disrupted when the plant life animates and attacks everyone... including Audrey, Chris, Duke, and Evi. Meanwhile, Nathan tries to come to terms with Audrey's new relationship with Chris.

Audrey discovers that the same five hours keep repeating over and over... and each time before resetting, someone close to her dies in a car accident.

An apparent drowning suicide turns up on a Haven beach, and Audrey and Nathan soon discover that he is tied to an enigmatic family compound, and that the family has abducted a local woman's child. Meanwhile, Duke learns that the family is connected to the tattooed man.

A straight-laced banker hides a double life... literally. Meanwhile, Driscoll continues his plan to remove Nathan from office and Duke helps a runaway.

An unidentified Troubled individual unleashes a virulent plague in the station house. The new chief of police orders a quarantine, trapping Audrey, Nathan, Duke, Evi, and Chris inside.

A teen seemingly dies at the hands of a serial killer, but an investigation soon reveals that the killer is dead and the teen may be Troubled. Nathan and Audrey search the woods for the boy, but soon discover they have unwanted assistance from Driscoll... and Duke Crocker.

Two mummification deaths increase the town's tensions in the aftermath of Audrey's shooting of Reverend Driscoll. While Nathan decides which side he will support, the Troubled or the unafflicted, Audrey finally locates Lucy Ripley and Duke joins forces with Dwight to learn his father's secrets.

As the civil war between normals and Troubled in Haven comes to a head, Nathan and Duke are visited by the ghosts of their fathers... and Reverend Driscoll, who plans to eliminate the Troubled once and for all with the help of someone close to Audrey.

After a surfer is cut in half in the middle of the harbor, Audrey soon realizes that everyone is celebrating Christmas... in July, with no idea that anything unusual is going on. Things become more sinister when people disappear and no one but Audrey can remember they ever existed.