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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
Sweet Danger
When a forgotten Balkan principality suddenly becomes strategically vital, the British Government enlists unconventional detective Albert Campion. He must recover the long-lost proofs of ownership, hidden in the seemingly tranquil village of Pontisbright. But a ruthless financier is also on the hunt, turning the rural calm into a dangerous race against time, where Campion and his allies face unexpected perils.