Another Scandal in Bohemia — Carole Nelson Douglas

The ever-irresistible Irene Adler, her dashing barrister husband, Godfrey Norton, and the indomitable Miss Nell Huxleigh have arrived at last as their French cottage-having survived dastardly plots, Russian spies, pistol-wielding criminals, and the occasional cobra. The happy trio seeks nothing but rest and peace-but Irene has always chafed under idle conditions, and Paris, she says, "is pretty and urbane, but hardly a center of excitement." So when Charles Frederick Worth, the Parisian king of couture, invites Irene to become his "mannequin de ville," to wear the fabulous worth creations to stimulate his trade, Irene leaps at the chance.
But what was a joyous lark soon turns into a journey that can lead to disgrace, dishonor, and death when Irene, Nell, and Godfrey are drawn into a series of events that will compel Irene to the one place that she daren't go and the one man she must not confront-Prague and the King of Bohemia.
(formerly Irene's Last Waltz)