Scott is forced to ask Allison’s father for help when they can’t match the speed of Cora and Boyd. Lydia finds a body but does not know why she was even there. Scott’s mother shows the bodies to Stiles who points out that they were not Werewolf murders, he discovers that Heather is dead and connects the dots. The serial killer goes after virgins. In an epic plan, Derek manages to render both Cora and Boyd unconscious.