Identifying the guilty isn't always easy . . . DCI Alex Fleming returns to work after convalescent leave to find that the Assistant Chief Constable wants him to review an old cold case. William Stroud, a union activist, was shot dead five years ago after a strike at the Atomic Weapons Establishment organised by the union leader, Bill Kauffman. No one had ever been arrested for the crime and, unknown to Fleming, MI5 have an interest...