The secret agent Geoffrey Chaucer and his assistant Corbino, a port urchin, receive an encoded letter from Eleazar of Cavalry, a Sephardic Jew who works for the secret services of the Crown of Aragon. The letter reveals facts that put the safety of both in danger. Accompany the secret agent Geoffrey Chaucer and Corvinus (his faithful servant), Argentina, and Eleazar of Cavalry, in his enigmatic journeys across Europe in the fifteenth century. The reader will enjoy the intrigue of espionage and counterespionage in this novel of mystery and adventure with a fantastic dimension. The novel deals with the idea that human beings are almost always forced to accept, in order to survive, not only the rules of the existing power in their time in history, but also to follow what is politically correct. The reader experiences echoes of a past whose basic features are still very much alive in current society; that is, it is still very difficult for the individual to express himself in a truly free manner.