A Face for a Clue (1931) by Georges Simenon is the second Maigret novel in the volume of two pictured above. Maigret is a detective I enjoy reading about. He is a fascinating character. There's a list of the novels here. This particular book has been adapted for film and television, including as The Yellow Dog in 1932, but I haven't seen any of them.
M. Mostaguen, the wine dealer at Concarneau, is wounded by a gunshot when returning home drunk from the local Admiral Hotel and Maigret, who is organizing the mobile squad in Rennes, is called in by the Mayor to solve the crime. Maigret settles down at the hotel and discovers a set of curious characters...The New York Times says, "After reading one book by Simenon you'll always want to read more."