This is the tale of how a Greek slave, Lucinius, becomes an influential religious leader and literary figure in the First Century A.D.  His spiritual awakening is prompted by an unlikely mentor, a Centurion, who was at the crucifixion.  

Lucinius is ordered by his master to assemble the stories told by eye-witnesses to the life and death of Jesus Christ.  Cornelius was the Centurion at the Crucifixion. Cornelius is hated by the Jews and the Romans.  He is haunted by the Crucifixion because he won the shroud worn by Christ in a game of dice.  He takes Lucinius on a journey throughout the Empire and tells him what seem to be fantastic stories about famous Romans during the era of the Republic, some 100 years ago.  These stories contain elements which Cornelius could not possibly know, unless he is making them up or unless there is some other explanation.

The book answers the question of who wrote the Gospel of Luke and why he wrote it.  The book answers the question of who is Cornelius and why he said Jesus was an innocent man at his Crucifixion.   Thus, it is a tale of the two men's spiritual journeys.