It seems that jeweler Michel Goldfinger killed himself by shooting himself after insulting the police from a public telephone. Michel was ill and was in financial difficulties, at least so says his wife Matilde. But some things do not add up: a life policy stipulated in favor of his wife which also contemplates suicide; the suicide of a Pole that occurred six months earlier like Michel's; and then the very different behaviors of Matilde and Eva, her sister, regarding Michel's death. Maigret will come to pull the strings of the various clues and find out the truth.
—Baldinotto da Pistoia