The great Giordano Bruno, fleeing the Inquisition, flees to England. In this country, where a Protestant queen has been sitting on the throne for a quarter of a century, opposition from adherents of the Catholic faith is still strong. At the royal court, Bruno receives a task - to go to Oxford, the secret stronghold of Catholicism, and find the threads of a conspiracy against the queen. There, in Oxford, it seems that the book he coveted is hidden, containing the key to unraveling the mysteries of the universe. However, exposing the conspiracy and the search for the book are unexpectedly complicated by the fact that a series of mysterious murders are being committed in this quiet university town, which Bruno undertakes to investigate.