My Lady's Diamonds (1901)

Set in Victorian-era London, the novel follows Hugh Garth, who is tasked with investigating the theft of a diamond necklace belonging to Lady Julia Martyn. As he unravels the mystery, Garth discovers a complex web of secrets involving Lady Julia's family, revealing deeper motives behind the crime. Themes of love, betrayal, and redemption permeate the story, enhanced by a diverse cast of characters, including Lady Julia's daughter and a mysterious Frenchman. The intricate plot and suspenseful twists make this classic mystery a compelling read.