Audrey Parker begins seeing Christmas decorations mysteriously popping up all over Haven in the middle of July yet nobody else, including Nathan, seem to feel anything is unusual. Yet, when Haven residents start disappearing into thin air, Audrey convinces Nathan they must find a way to stop it.

The Biblical Plagues of Egypt strike Haven, while Audrey deals with a woman who claims that she is Audrey Parker and Nathan copes with the passing of his father. Meanwhile, Reverend Driscoll begins his plan to take control of Haven and eliminate the Troubled.

People start seeing their worst fears, and Nathan and Audrey realize that the visions are tied to the theft of a puzzle board that can destroy Haven. Meanwhile, the new Audrey tries to track down the mysterious FBI Agent Howard and learns of his connection to the late Chief Wournos.

While FBI agent Audrey pursues the investigation into the fake Agent Howard, Nathan and Audrey deal with an outbreak of machines with mind of their own... and a desire tohug.

A mysterious Haven resident may prove the key to helping Nathan and Audrey stop an outbreak of electrocutions. Meanwhile, Duke reluctantly accepts his ex-wife's help finding a way to protect himself from the tattooed man.

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.

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 sleeping 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.

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.

A teen seemingly dies at the hands of a serial hugger, but an investigation soon reveals that the hugger 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.

Shocking secrets from their past and an unexpected kiss put Audrey, Nathan, and Duke on a collision course with their destinies.

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.