The events of the gripping novel take place in our days. Leonid Gerdin, a former KGB officer who underwent a double recruitment, lives in Israel. Officially he is listed as dead and lives in the country under a false surname, after plastic surgery. Taking part in a secret investigation, he comes into contact with a secret Order of the Guardians, whose history goes back to the Middle Ages. An overwhelming majority of the events described in the book are based on real events.