A plague of insanity strikes at a local hospital, causing the doctors to go insane... and the patients to become normal. Audrey and Nathan seek to discover the cause before it spreads further.

A drowning case exposes a secretive family compound on the outskirts of Haven, from which children have disappeared under mysterious circumstances.

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.

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

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.

When Haven falls into a deep sleep, Audrey must work with the only other person awake in town. Meanwhile, more questions arise about the Bolt Gun Killer.

Nathan and Duke try to help Audrey search for a troubled killer after a string of murders take place at the Haven High School.

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