The Catholic Book Club discussion

During the war of the Roman Empire against the Parthian Empire, in the time of emperor Marcus Aurelius, the young Flavius obtains a position in the legions as a standard bearer. His father wishes to separate him from Christianity, the religion he has converted to. The boy must face many dangers, travel to far away countries and work as a spy of the Roman Empire. After finding true love, he must deal with a complex moral issue that will be solved providentially, in a way he would never have foreseen.