Plans for building a new barn are complicated when an old trouble brings the Haven Police Station to life. It's up to Audrey and Nathan to find a way to regain control, but their efforts are hampered when a mysterious killer leaves a wake of bodies right under their noses.

Nathan and Dwight race to rescue Audrey from Croatoan, but the consequences of Duke's dark destiny wreak havoc on their plans. Meanwhile, Vince contemplates an unusual sacrifice.

Hope of ending the troubles begins to fade as the heroes struggle to rebuild the Barn in the face of mounting obstacles. And while Dwight is tempted by a surprise gift, Nathan finds himself considering a devastating sacrifice.

Nathan struggles to return to Haven as Dwight reconsiders his future in the series finale, which also finds Audrey coming to a terrifying decision about how she might finally save the town from Croatoan.