The Yellow Dog, Georges Simenon

There was an exaggerated humility about her. Her cowed eyes, her way of gliding noiselessly about without bumping into things, of quivering nervously at the slightest word, were the very image of a scullery maid accustomed to hardship. And yet he sensed, beneath that image, glints of pride held firmly in check. She was anaemic. Her flat chest was not formed to rouse desire. Nevertheless, she was strangely appealing, perhaps because she seemed troubled, despondent, sickly.

In the windswept seaside town of Concarneau, a local wine merchant is shot. In fact, someone is out to kill all the influential men and the entire town is soon sent into a state of panic. For Maigret, the answers lie with the pale, downtrodden waitress Emma, and a strange yellow dog lurking in the shadows...