FBI agent Audrey Parker travels to the town of Haven to investigate the death of an escaped prisoner who fled to his hometown. She soon discovers the man's death is merely the tip of a very large iceberg of supernatural phenomena.

Haven is stricken by a mysterious plague when animals and plants alike are destroyed by exposure to hydrochloric acid with no discernible source.

Young men in Haven start aging at an accelerated rate, and Audrey and Nathan attempt to find the source.

A series of fatal animal attacks lead Audrey and Nathan to investigate a local woman who supports animal rights. However, they soon discover that while she may not be Troubled, the person responsible is... and Chief Wournos is the next target.

Two mysterious assaults involve crooked businessmen, and sketching charcoal is found at each crime scene. However, the boy the officers suspect is responsible becomes a third victim, leaving them to pursue a new line of investigation.

Audrey and Nathan learn of a ghost story that wanders the Haven clinic and takes the lives of sick people before their time.

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