Mary Brandon was the beautiful, sweet, and gentle daughter of Sir George Brandon and his wife Lady (name not recorded) Clayton, daughter of John Cecil Clayton, 1st Duke of Greystoke. She married an officer in the Royal Navy, Joshua Spade, and went with him and their two children Samuel and Mary when he resigned his comission and emigrated to the United States of America. Reading between the lines, she may have been a mistress of Harry Flashman.

The Brandon and Spade families, and what little is known of the scandal that drove Captain Joshua Spade to leave Britain, are discussed by Philip José Farmer in Doc Savage: His Apocalyptic Life.

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