They included Maigret's Failure (1962) and Maigret and the Enigmatic Lett (1963), a translation of the very first novel in the series, Pietr-le-Letton, first published in 1931.
The collection contained "Maigret's Failure" (1962) and "Maigret and the Enigmatic Lett" (1963), a translation of the first novel in the series, "Pietr-le-Letton," which was initially published in 1931.