The legions are in tatters, and the Gothic hordes are gathering beyond the mountains . . .

377 AD: Thracia's legions are few and broken in the wake of the Battle of Ad Salices. But the scattered centuries and cohorts rally in an effort to blockade the Haemus Mountain passes and hold back the relentless attacks of Fritigern's swelling Gothic armies. These passes must endure until Eastern Emperor Valens and Western Emperor Gratian can muster and bring their Praesental Armies in relief.

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 . . .