The inside story of Mark Kennedy, the police officer who spent eight years undercover as a dedicated activist, having infiltrated the environmental movement and Europe's left-wing extremist political groups. Now, with his cover blown, Kennedy has lost his wife and children, and the friends he made during his time with the protesters have labelled him a traitor. In this Cutting Edge film, he discusses the consequences of his actions, as police bosses claim he has forgotten who he really is.