The old man sits on a stool at the end of the bar counter in the Covenanter Bar. What few people know is that he is an expert at solving abstruse problems. One who does is Inspector Adam Bailey. When he has a difficult case to which he can see no solution, he goes along to the Covenanter Bar and puts the facts to the old man, hoping that he can see a way through the problems to a solution. In this volume the old man solves sixteen cases that have baffled the police by the use o logical deduction.