In July 1949, an unpopular and deeply unpleasant man is stabbed to death in the courthouse of an English city. As the murder has been committed in a room to which the general public doesn't have access, it seems probable that the culprit is someone involved with the business of the courts. Suspects include a number of lawyers, police officers, and magistrates. For various reasons, the local Chief Constable decides to ask Scotland Yard...