Audrey's surprise birthday party at a local hotel goes awry when a shapeshifter stalks the partygoers, and nobody knows who can be trusted.

Nathan and Audrey investigate a series of murders, but the prime suspect insists that she's trying to stop the real killer. Meanwhile, in the aftermath of Duke's revelation, Audrey continues to investigate the Colorado Kid mystery involving her mother.

Audrey joins in a friendly game of poker aboard Duke's ship, but the two new players soon lock everyone up and try to find a box that Duke is smuggling. Meanwhile, Audrey's boss arrives in town and demands answers.

As the mysterious cracks spread throughout Haven at an increasing rate, a mysterious criminal returns to Haven and Audrey discovers the secrets of her past and her mother's.