English tale of an encounter on a train between a judge and a lunatic who claims to have securities for the theft of which others are to be tried. The lunatic is recaptured and the judge finds the accused men guilty - but doubts lead him to the asylum where he establishes that the lunatic had stolen them. Irony of judicial pomposity and certitude, and lunatic truth ... Slight. Familiar themes: crime, justice, madness. (PB)