377 AD: Numerius Vitellius Pavo and the men of the XI Claudia return to Constantinople from their brutal Persian sortie to hear widespread tales of Thracia's plight and the precarious mountain blockades. Each of them knows what is at stake should those passes fall: the heartland of the Eastern Empire would face the wrath of the barbarians and loved ones would be at the mercy of their savage blades. When the Claudia are despatched to aid the effort at the mountains, Pavo can think only of two souls wandering in the jaws of the Gothic threat: his beloved Felicia and his lost half-brother, Dexion. So he and his comrades march at haste, headlong into the storm that awaits them . . .