Maigret and the Hundred Gibbets

Maigret was in high spirits on a visit to Brussels. For fun he started to trail a down-at-heel man he had seen packeting up
thousand-franc notes and posting them as 'Printed Matter.' But the jaunt turned sour at Bremen, when the quarry took out a gun and
shot himself: and Maigret knew he was to blame. In the end it was in a crazy slum at Liege, Simenon's birthplace, that the inspector
heard a story so macabre, so sick, so sordid that it made remorse irrelevant.