Vienna, 1711. Eleven years after the events of Secretum, and by means of a mysterious bequest, Atto Melani arranges for his faithful helper to relocate from a Roman slum to the imperial court in Vienna. Here, Atto enlists his help in a secret mission to bring about the end of the war between France and Austria. Meanwhile, a Turkish delegation has arrived in Vienna for talks with Emperor Joseph I, despite the fact that Austria is supposed to be at peace with the Ottoman Empire.

When the emperor suddenly falls ill with smallpox and students are targeted by a serial killer, fears grow that a centuries-old power struggle has been reignited. What can Atto and his helper do to prevent Europe from descending into all-out conflict?

An unfinished palace known as the Place with No Name, an exotic menagerie and a fantastical Flying Ship are just some of the ingredients of this baroque spy novel which will intrigue and delight fans of Monaldi and Sorti's series.