The narrator of this story is Camul, a Gaul of noble family at the time of Julius Caesar's conquest of Gaul. His friend Acco offends the goddess Pyrene and so the two of them leave their tribe to join the Roman army as auxiliary cavalry. They accompany Publius Crassus on his father's (Marcus Licinius Crassus) ill-fated expedition against the Parthians. But, wherever they go, Acco feels himself to be pursued by the goddess; under different names but with the same character.
Duggan paints a vivid picture of the culture of the Gauls and also of Rome and Syrian Antioch seen through Gallic eyes. However, since the story is told in flashback and we all know what happened to Marcus Crassus' expedition, there are no real surprises, no unexpected twists of the plot.