|My little green book|
The French title was Maigret et son mort, published in 1948, and translated into English in 1964.
There's a full plot outline here and more here.
Basically the novel deals with a plot that focusses on the theme of organised crime.
This theme concerns a gang associated with a series of vicious attacks on the occupants of isolated farms in Northern France culminating in their murder
The reason for the attacks is to steal as much money as possible from the farms and the murders are carried out so as to eliminate any witnesses to the gang’s identity.