Satan's Stratagem: Are these the last days of humanity?

An archaeology student in Bohemia narrowly escapes a mysterious death and is found in traumatic shock. Her bloodstained clothing and mysterious magical symbols that someone painted on her body in blood indicate that this is no ordinary criminal case. Dr Runa, an expert on satanic cults and a specialist in the occult, is asked to help with the investigation. The search leads him to the former Benedictine monastery in Podlazice, where the attacked girl, along with other students and teachers, was working at an archaeological excavation site. While the police discover other victims with unknown symbols on their bodies, Runa discovers that the same magical signs were also found on recently discovered graves in the middle of the monastery, in places where women and children were buried instead of monks. However, the strict regulations of the Benedictine Order forbade this. Who violated these rules and why? Moreover, all the buried bodies bear traces of violence. Are they victims of a medieval murderous satanic cult? Are their deaths, which occurred seven hundred years ago, connected to the current series of ritual murders? What role does the book created under very strange circumstances in the Podlazice monastery - the Devil's Bible (Codex Gigas) - play in this? Why is the exact date of the attack on the World Trade Center in New York encoded in the image of the devil? And what trick did the devil play on those who believed in him?