Steed and cathy discuss the mysterious death of Vinkel, a member of the opposition. Steed thinks they are purging the organisation, but then a man, martin, tries to kill Steed in revenge for Vinkel's death. Steed protests his innoncense and martin is finally persuaded to take Steed to his superior Keller. "The correct way to kill" (Emma Peel, colour) is a remake of this episode.