The Swabian Affair presents the third books of a memoir written by a retired Roman soldier, Gaius Marius Insubrecus, who served Caesar during his wars in Gaul. As a youth, Insubrecus is caught between two worlds: the heroic myths of his people, the Gah'el, and the harsh realities of their conqueror, Rome. Insubrecus tries to escape assassins sent after him from Rome by hiding in the Roman army, right at the time that the new governor, Gaius Iulius Caesar, launches his legions into Gaul to stop a Germanic invasion led by a mystic warrior king called Ariovistus. Insubrecus is plunged into a world of violence, intrigue and betrayal, as he tries to serve his new patron, Caesar, and to stay alive, while pursued by a Roman cutthroat and Germanic warriors.