Miranda's (Halle Berry) husband and the sheriff have actually been torturing and killing women for years at Willow's Creek (thus the "not alone" meaning there were 2 killers). They killed the Doctor's daughter which had been ruled a suicide. The ghost of the doctor's daughter is the one who possessed Miranda and killed her husband. The sheriff (who bears the "fire" tatoo) is killed in a blaze at the station while trying to murder Miranda. Miranda and Chloe are both released from the psychiatric hospital.