Nathan and Dwight investigate missing children linked to an ancient legend, while Duke tries to find Audrey by focusing Jennifer's trouble.

A deadly sea trouble threatens to crush the town.

William is determined to convince Audrey of the truth behind her origins; a seemingly unstoppable curse is unleashed.

Nathan makes a desperate play to protect Mara from the furious citizens of Haven, leaving Dwight and Duke to deal with a deadly trouble that threatens to burn the town to the ground.

When Audrey and dozens of Haven citizens are affected by a mysterious illness, the symptoms threaten to expose Haven’s secrets to a dangerous newcomer.

Dwight and Charlotte work to clear Nathan's name when the citizens of Haven put the lawman on trial. Hoping to buy them time, the brothers Teagues moderate the courtroom proceedings, while Audrey continues her quest to solve the darkness troubles.