While Audrey draws ever closer to losing herself, the others try to open the door and send William back.
When Audrey won't accept that she helped create the Troubles, William unleashes a new Trouble-related curse on Haven.
The Darkside Seekers' presence in Haven threatens to reveal the existence of the Troubles to the world.
Lexie's attackers from the Bar reveal themselves and their hostage--William--in Haven. To stop them, Audrey must rescue William if she hopes to find out the source of the new Troubles plaguing the town.moreless
An ocean-related Trouble brings the crushing pressure of the depths to Haven, while Audrey and Nathan discover that the residents' Troubles are mutating.
Audrey and Nathan go after a Troubled who can enter people's dreams, while Duke hunts down his brother.
Nathan gets a new partner as he tries to track down a Troubled person who can change its victims' personalities.
Children in Haven begin disappearing and the cause may be related to an ancient legend. Meanwhile, Duke and Jennifer try to pinpoint Audrey's location.
While Duke tries to convince Wade to leave Haven, Nathan and Dwight investigate murders where the victims are drained of their blood.
When a Troubled immolates the citizens of Haven, Nathan and Duke have to take time off from their search for Audrey to deal with it.
Six months after the Barn disappears, Duke reappears in Boston. He meets a woman who claims that she can hear the voices from the Barn, and takes her back to Haven to try and find Audrey. The Troubles haven't ended, and the townspeople blame Nathan, who is living as drifter because the Guard wants him dead. As they deal with a Troubled person whose ability has come back, Audrey resurfaces... as a bartender named Lexie.moreless
Emily provides some constructive criticism for Dr. Bendari on the attending evaluation form, but panics and tries to get the form back when she learns that Dr. Bendari reads the evaluations herself. Will asks Cassandra to befriend Emily, and they both watch while Will makes his first cut on the operating table. Dr. Bendari's first heart patient returns for another procedure, but he must remain awake due to an allergic reaction to the anesthesia. During the operations he suffers a near-death experience, causing him to start questioning his faith in God. A young couple brings their baby in for stomach pains, and they are shocked to learn that they have an intersex child and must decide if they want him to remain a boy or switch genders. Tyra learns some unsettling news about her father and becomes upset with Emily after finding out that Emily had been hiding the truth from her. In retaliation, Tyra tells Cassandra that Emily asked Will not to date her.moreless