Oeillet rose, tome 4
Lauren Willig2008

In the fourth installment of the Pink Carnation series, Mary Alsworthy suddenly finds herself on the outside of polite society after her younger sister, Letty, marries Mary's intended. Partly from boredom, partly from fascination, Mary accepts the advances of spy master Lord Vaughn when he asks her to help uproot a French spy called the Black Tulip who has a weakness for dark-haired women. As it turns out, the Black Tulip is no longer interested just in beautiful companions; he demands a sacrifice of Mary that she is reluctant to make. Navigating both the world of high society, where, if Mary doesn't find a husband soon she'll be doomed to live off her sister's charity, and the underworld, Mary may only realize too late that the Black Tulip is more connected to her than she ever imagined.

Titre original : The Pink Carnation, book 4: The Seduction of the Crimson Rose (2008)