Nathan returns to the school without Kira and gives her fiancee Tony the sad news that Kira is dead. Haven catches a break - the lights are back on, so they've eliminated the Darkness Trouble but now they've got to quell an angry mob accusing Nathan of murder.
The citizens of Haven put Nathan on trial for his life, and it's up to Dwight and Charlotte to clear his name. Hoping to buy them time, the brothers Teagues moderate the trial as Audrey continues her quest to solve the darkness trouble.
Dwight and Charlotte work on a way to free Audrey from the Sandman's stasis before he can trap her in his mind forever. Duke tries to help Darkside Seeker Seth Byrne recover his memories of Haven.
Nathan and Vince travel back to 1983 to learn the secret of how Croatoan has found a way into Haven. Meanwhile, Duke finds his life on the line when he is apprehended by a mysterious foe.
Nathan is still stuck in the void with William, Audrey and Duke must convince Haley to open the thinny before its too late for Nathan. Dave confronts Croatoan in his mind.
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.
Haven's heroes struggle to rebuild the Barn in the face of mounting obstacles. Dwight is tempted by a surprise gift and Nathan must consider a devastating sacrifice.