Haven

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.

Audrey remains in Haven to investigate her mother's connection to the Colorado Kid, but ends up working with Nathan to determine the cause of a mysterious series of incidents that involve butterflies and otherworldly phenomena centered on a angry reverend, his passive daughter, and her foster son.

A plague of insanity strikes at a local hospital, causing the doctors to go insane... and the patients to become normal. Audrey and Nathan seek to discover the cause before it spreads further.