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.

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.

On Halloween night, Audrey, Nathan and Duke become trapped inside a haunted house.

While Audrey and Duke track down the Colorado Kid's parents, Nathan and Tommy investigate Troubled incidents involving the resurrection of dead for payment.

Audrey and Duke return from Colorado. Audrey, Duke and Tommy try to find the woman with the resurrection touch. Meanwhile, the Teagues realizes that the Bolt Gun Killer has tricked them and track the murderer to his real target.

Dwight struggles to maintain order when Duke's trouble wreaks havoc around town; at the same time, Audrey and Charlotte work together to drive away a mysterious fog that has everyone trapped in Haven.