186 pages
French language
Published Nov. 3, 2005 by Librairie générale française.
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During a final visit to the cell of condemned prisoner Jean Lenoir, Maigret picks up a negligently dropped remark about an unsolved-in fact, unreported-murder committed in Paris six years before. It seems Lenoir and his partner witnessed the dumping of a body in the Saint-Martin Canal and used the information to blackmail the murderer.