Mrs. Gainsborough's Diamonds: A Story is a novel written by Julian Hawthorne and published in 1888. Set in the late 19th century, the story revolves around the theft of a valuable diamond necklace belonging to Mrs. Gainsborough, a wealthy and influential woman. The investigation into the theft is led by detective Allan Armadale, who must navigate the complex social dynamics of high society in order to solve the case. Along the way, Armadale encounters...