Episode Description: Beware, spoilers! To read - hover over the text.
Sam and Dean investigate a case in Chicago, where, as it turns out, several clans of monsters controlled by the dark side of the city. One of the families Changeling manages Margo Lassiter, whose leadership is threatened when she comes home her brother. Another "ruling" family in the city consists of werewolves under the command of Julian Duval. In addition, in Chicago, Sam and Dean meet Ennis, a man with a vendetta against the monsters. The winchesters warn him about the difficulties of life as a hunter, but Ennis refuses to listen and takes on a dangerous path.