In 1529 the vast Turkish army threatens Vienna and all of Europe, but at the core of the conflict is the fabled Herzwesten beer, brewed in Vienna ever since the city was a Celtic village. And from both East and West, ancient supernatural forces are gathering to take part in the fight.

Gray-haired soldier of fortune Brian Duffy, hired to be a bouncer at the inn that houses the brewery, only hopes to find the girl he was in love with years ago—but he learns to his dismay that he is a crucial figure in a centuries-old war for the heart of the civilized world.

Swept up in the bloodshed and sorcery of the epic Siege of Vienna, fighting Eastern demons and leading mythological Western allies, Duffy learns his true identity and destiny in the crucible of a war that decided the fate of Europe.