London, England. 1925: A Russian prince. A hotel scion. An impoverished earl's daughter. Which one will make an untimely exit from the London social scene?

Scotland Yard Detective Inspector Devenand Hunter finds himself in the middle of a series of upper-class deaths in London. The murderer has decided to extinguish Bright Young People in their favourite night spots, from a sleazy jazz club to the Savoy ballroom. Dev knows someone who can help him navigate the treacherous society waters: Lady Adelaide Compton, a marquess' daughter and widow of a Great War hero. Unfortunately, Dev put her in jeopardy once, nearly leading him to turn in his warrant card.

But when Addie's sister, Cee, is nearly one of the victims, she turns to Mr. Hunter, offering her help. He's reluctant, but she has an ace up her sleeve — flying ace Major Rupert Charles Cressleigh Compton, her late and unlamented husband and part-time ghost. Still trying to earn his celestial wings protecting his widow, Rupert is eager to assist, even if it means that Addie and the Anglo-Indian detective might become something more than friends.