From the publisher blurb:
Dungen Crawl in the Thirty Years' War
Autumn 1631: Germany is plagued by the Thirty Years' War. Bruckstadt has so far been spared, neither mercenary bands nor epidemics have reached the little town on the Katzbach. The inhabitants attribute this to the protection of St. James, whom they honor every ten years with a festival. In 1631 it should have happened again, but the explosion of the town‘s powder store buried the entrance to the saint‘s tomb.
The saint, the citizens are convinced, will therefore no longer hold his protective hand over Bruckstadt. Count Reuben Wolfsgrau is now looking for volunteers to find another way to the tomb of St. James. A way through the Roman catacombs, where dangers lurk from beyond the grave.