Plot summary
Duke and Hailie return to Haven in hopes of Hailie opening a thinny so Nathan can travel to the void and get the controller, the last piece needed for the new barn. Duke encounters Lisa, a woman who wants revenge, so he and Audrey must calm her before she destroys anything else. While in the void, Nathan has an unpleasant reunion with William who has been stuck in the Void since Audrey banished him. He leads Nathan to the old wreck that was once the barn, so Nathan can get the controller and so William can reunite with Mara on the other side, unbeknownst to him that she is gone.
Vince, Dave and Dwight eventually come across Boyd, a man with an exorcism trouble, hoping it will release Croatoan out of Dave. Audrey and Duke talk through to Lisa by explaining the troubles will end soon. However, Hailie does not want them to end since her newfound "power" can rake in money. William realizes Nathan lied about Mara still reigning over Haven and attempts to kill him. Just before Nathan can escape the void, Hailie closes the thinny, leaving him trapped with William.
Credits
Adapted from Wikipedia contributors, Haven season 5. HTML formatting and reference markers removed.