Rex Mundi is a murder mystery set in a 1930s Europe where sorcerers stalk the streets at night and the Roman Catholic Church never lost its grip on power. Master Physician Julien Saunière must uncover the two-thousand-year-old secret of the Holy Grail before all the world is drenched in blood!

In this issue, Julien and Genevieve flee Paris, on the run from the Holy Inquisition and the agents of the Duke of Lorraine. Their destination: a small town in the south of France where they will uncover the true nature of the Holy Grail. That is, if they survive the trip . . .

Meanwhile, the Prussian army swarms into the heart of France, within shelling distance of Paris itself! Has the Duke of Lorraine overestimated his prospects in the unfolding war?