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Margery Allingham
Margery Louise Allingham was an English writer of detective fiction, best remembered for her "golden age" stories featuring gentleman sleuth Albert Campion. - Wikipedia
More Work for the Undertaker
Albert Campion, a private detective and former Scotland Yard inspector, is offered a government post he turns down in favor of investigating two deaths at a boarding house. The case draws him into the underworld of Apron Street, where undertakers like Mr. Bowles quietly dispose of bodies for criminals — until their business becomes entangled with a plot to eliminate the Palinode family and seize their shares in a local bank.
A private detective and former Scotland Yard inspector who is offered a government post but chooses to investigate instead.