Sapphires Are an Earl's Best Friend (Jewels of the Ton #3) by Shana Galen
Enter stage right smart, sassy, knows her business, Lillian Beatrice Dawson, the Duchess of Charm, a notorious courtesan and in a reality government spy.
Lily is assigned to find the identity of Artemis the code name for an Englishman turned traitor who holds papers that would reveal the identities of English spies abroad.
It is suspected that culprit is the Duke of Ravenscroft. Early on hints are thrown out that all might not have been as it seemed in the Ravenscroft household.
Lily goes undercover as a guest at the Duke of Ravenscroft's house party. In truth more an excuse for a raunchy time for lechers and various women of questionable morals who skirt the edge of tonnish circles. Her assignment is to beguile the Duke, gain access to his home and search for the list.
Enemy agent, Lucifer, making another appearance in the Jewels series, is after the same list.
Unfortunately Andrew Booth-Payne, Earl of Darlington, the Duke's son, the darling of the ton and the man she has loved forever is there. Awkward!
Lily becomes engaged to the Duke and involved with Andrew.
Andrew is more a liability than a lover. He keeps foiling Lily in her attempts to search the house for the list. Really, I loose all patience with Andrew.
A tad too late in my mind he realizes that what he had before him in Lily was better than what he'd hankered after with Lily's friend, fellow courtesan and spy, Juliette.
He does admit to frequent lapses into idiocy so there's hope for him. Andrew just didn't grow up quickly enough for me and I really thought Lily deserved better. Lily sparkles, Andrew just doesn't.
A NetGalley ARC