Good Morning, Irene by Carole Nelson Douglas

In Victorian-era London and Paris, a fiercely independent former opera star and her prim, keen-eyed companion turn sleuth when society scandals entwine with jewel theft, blackmail, and murder. Navigating glittering salons and shadowy backstreets, they cross paths with famous figures and formidable criminals alike, testing wit and resolve as they unmask a ruthless mastermind in a daring, twist-filled pursuit that challenges convention and cements their unconventional partnership.