Haven is beset by biblical plagues. Duke continues looking for information on the tattoo, with a little help from his past. Audrey and Nathan check out Audrey II, and try to figure out what to do about Chief Wuornos.

The town's docks start attacking people while the other Audrey Parker probes Audrey's identity crisis.

When a deadly series of electrocutions occur around town, Audrey and Nathan investigate the cause

A wedding at an isolated estate turns deadly for the guests when the site becomes sealed off and something attacks from within.

A drowning case exposes a secretive family compound on the outskirts of Haven, from which children have disappeared under mysterious circumstances.

A banker hides a dark secret that connects him to a killer hiding in Haven. Meanwhile, Duke helps a young runaway and Nathan discovers that his job is at risk.

When a Troubled individual unleashes a rotting plague inside the police station, the new Chief orders a quarantine... trapping Audrey and the others inside. Meanwhile, Duke confronts Evi about her betrayal of him.