Ep 12. Don't You Forget About Me

Sheriff Donna calls the Winchesters for help when a bizarre string of murders leads her to believe that she and her family are being haunted by a vengeful spirit. Sam and Dean arrive in town to find that Donna has become a mother figure to two teenage girls, who she has taken in after their mother's murder - a murder that mirrors the one Donna's father investigated 27 years ago. As the ghost continues to target those close to Donna, the Winchesters work with her to uncover the truth behind the killings and put an end to the spirit's rampage. Meanwhile, Castiel struggles with his faith and finds himself at a crossroads in his search for answers about the darkness looming on the horizon.