Maigret and the Informer

Monsieur Maurice, one-time gangster and now well-respected owner of the celebrated Sardine Restaurant, is found shot dead on a quiet Montmarte street. Maigret, perplexed by an apparently motiveless crime, enlists the aid of the lugubrious but encyclopedically knowledgeable Inspector Louis in unraveling sme of the mysteries of the case; the superintendent soon finds cause to suspect the wifely devotion of Maurice's lovely blonde widow.