The Seduction of the Crimson Rose is the 4th in a series about a spy ring operating throughout Europe during the Napoleonic era. Mary Alsworthy is facing her 4th Season in London without any prospects of marriage, especially since her fiance accidentally eloped with her sister. Mary is brought into the employ of the Pink Carnation(number one spy) to help find the identity of a French spy known as The Black Tulip. Danger and adventure as well as an unlikely matrimonial prospect are the plot of this novel. The story is told within the backdrop of a present day researcher who is writing a dissertation about this ingenious spy ring. Moreover, while using the family papers from descendants of the various spies, she also is finding a romantic alliance. Good read and wonderful series.