Father Jonah Barlow is dead. The respected Jesuit scholar of apocalyptic studies might have died from a fall in his apartment...or was he pushed? All that is known for sure is that the provocative manuscript he was working on—a book that promised to reveal the upcoming fulfillment of ancient and recent prophecies, including the ghastly and shocking Third Secret of Fatima—is missing.

Two female detectives—one from Chicago, the other from Rome—take on the investigation as a possible homicide, turning to Vatican archivist Father Michael Dominic for his help, since Barlow sent the young priest the only other copy of the manuscript.

Newly elected Pope Ignatius, Enrico Petrini, intent on verifying the content of the manuscript against the original handwritten version of the Third Secret—which has been kept sequestered in the Pope’s personal vault for decades—discovers that the keys have been stolen. The search is on for the only other set, kept safely in the hands of a trusted monk in Jerusalem. Meanwhile, a sinister ancient order known as the Knights of the Apocalypse seem to be using the predictions of the manuscript to create fear and chaos as the prophecies appear to be coming fulfilled. Is the end of the world imminent?

From Chicago to Jerusalem to Scotland, from Rome to the ancient island nation of Malta, join Father Dominic, journalist Hana Sinclair, their trusted team of Swiss Guards, a French commando, and the two detectives as they solve the bewildering puzzles of the Petrus Prophecy.