When the Foreign Secretary Sir Philip Ramon receives a threatening, greenish-grey letter signed FOUR JUST MEN, he remains determined to see his Aliens Extradition Bill made law. A device in the members' smoke room and a sudden magnesium flash that could easily have been nitro-glycerine leave Scotland Yard baffled. Even Fleet Street cannot identify the illusive Manfred, Gonsalez, Pioccart and Thery - four just men dedicated to punishing by death those whom conventional justice can not touch.