Tell Me No Lies by Shelley Noble

Downton Abbey takes over New York City with an Agatha Christie type female detective. Lady Phil has come to New York for the summer and it is turning out to be interesting as she is asked to help a friend whose daughter's debutante party is tainted with the murder of the daughter's intended. Phil and her staff of butler and lady's maid (both of whom are well equipped to care for their boss both at home and in her professional capacity) begin sleuthing to find the killer. Phil is delightful, smart and loves danger especially the mystery man who may offer a romantic diversion. This is a must for those historical murder mystery lovers particularly those that appreciate a smart woman who doesn't cater to what polite society thinks.