Summary:

In a future 2040, the church is considering the canonization of Pope Innocent XI. An unusual seventeenth-century manuscript is brought to the attention of the authorities and the bulk of the novel is its transcription in full.  

The manuscript is the diary of an intelligent, but inexperienced young orphan-apprentice who is working in a Roman hostel in September 1683. The Catholic Church is fighting the Ottoman Turks who have besieged Vienna. Tensions with France are high as that country and its king have long asserted their exemption from Church rule.

 A hostel guest dies, and the authorities, suspecting plague, impose a quarantine. The apprentice falls under the influence of another confined guest, Atto Melani, a famous castrato and spy for King Louis XIV of France. Believing that the deceased guest was murdered, they venture out each night into subterranean Rome searching for clues to support their theory and leading them to investigate poisons, panaceas, and political plots. Meanwhile, a physician also confined to the hostel attempts all remedies to prevent plague, while another guest, besotted with astrology, strives to reveal the future, and yet another plays soothing music. 

Like a baroque Agatha Christie novel, plausible suspicion is cast upon every guest until the truth emerges and with it many doubts about the saintliness of Pope Innocent XI. The 2040 writer invites the Holy Office to consider the implications of the manuscript before proceeding with the canonization.

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