| In the 1943 L'Inspecteur Cadavre [M's Rival] |
 | The doctor said he remembered that M had solved the Landru case, one that M had had nothing to do with. |
| In the 1950 Les mémoires de Maigret [M's Memoirs] |
 | In the space of half a century, there hadn't been more than a score of sensational cases, including the Bonnot case, the Mestorino case, the Landru case, the Sarrat (sic) case, and a few others.... |
| In the 1951 Maigret, Lognon et les gangsters [M and the Gangsters] |
 | M felt like answering, "And Landru? Was that child's play too?" |