The Grand Tour: Or, the Purloined Coronation Regalia: Being a Revelation of Matters of High Confidentiality and Greatest Importance, I - Patricia C. Wrede

Kate and Cecy are off on a Grand Tour of the Continent with far too much luggage, their adoring husbands--and, oh yes, orders from Wellington, himself, to thwart a magical plot to take over Europe. Kate and Cecy and their new husbands, Thomas and James, are off on a leisurely tour of the Continent. But once they arrive in France, strange things start to happen. Cecy receives a mysterious package, Thomas's valet is assaulted, and Kate loses a glove. Soon it becomes clear that the newlyweds have stumbled upon a magical plot to take over Europe, and they must embark on a daring chase to thwart the evil conspiracy. There's likely more trouble ahead--for when you mix Kate and Cecy and magic, who knows what's going to happen next!