It is set in summer/autumn 2013[3] and was published in 2015. The protagonist is Dr. Dominique "Mo" O'Brien, the wife of Bob Howard, the protagonist of previous books in the series and also an agent for the intelligence agency known as the Laundry.As the world lurches toward the potentially apocalyptic forces that will probably bring about CASE NIGHTMARE GREEN (the Laundry's codeword for an inevitable worldwide awakening of Lovecraftian horrors, "the stars coming right"), regular humans have started developing superpowers. Mo is promoted to management, tasked to create an inter-agency department to coordinate between The Laundry and the police; two of the Laundry personnel assigned to her team are Ramona (fromThe Jennifer Morgue) and Mhari (The Rhesus Chart), women who have history with her estranged husband Bob Howard. She is also the holder of the powerful magical Erich Zahn bone violin that she calls Lecter. Lecter is increasingly asserting its power, including induced dreams that relate to The King in Yellow. She is unwillingly compelled to act in a police plot to control the minds of the British public in the interests of law and order, which it becomes clear will backfire, releasing the King in Yellow; she overcomes it with the help of her staff, destroying Lecter in the process.