In the third installment of the Caroline Case Mysteries, the newly married, beautiful, and independently wealthy Caroline Case Jones leaves Chicago and then New York for Europe on the luxury ship Isle de France in 1929. She and Hannibal, her enigmatic new husband, enter a war-scarred continent embroiled in social turmoil and political upheaval. Their reputations as efficient and effective sleuths have preceded them. As Caroline and Hannibal travel to and across France, they use forensic techniques and deductive reasoning to solve a variety of perplexing murders. Chief Inspecteur Soucet from the French Gendarmerie Nationale gives Caroline a new nickname: 'la Chatte dans la Fenêtre,' which translates to 'The Cat in the Window.' In addition to solving murders, Caroline is an avid fashion shopper in the finest salons of Paris. While shopping at Coco Chanel's, Caroline saves the granddaughter of a notorious gangster from an attempted kidnapping. The grateful granddaughter teams up with Caroline to bring rival gangsters to justice. By this time, Caroline knows too much about the operations of the Paris underworld for her own good. The godfather of a decimated Paris gang wants to extract information. He has Caroline kidnapped. Caroline escapes into the French wine country near Mâcon, where she samples the finest wines and battles her pursuers.