Feast of the Dead. Mon Dieu Cthulhu!, #2

Swashbuckling Supernatural Adventure! It is late 1810 and as autumn turns to winter, Napoleon's Armee Iberian settles down to its siege of Wellington's "accursed earthworks" at Torres Vedras. Dashing French Lieutenant, Gaston Dubois, is given his first independent command: leading a detachment of  hussars, those "thieves on horseback" into the Spanish interior, in search of intelligence, supplies and plunder. After a bloody skirmish, Dubois and his men take refuge at the Monasterio de St Cloud, an ancient ruin standing at the crossroads of this war-torn land, which now serves as a field hospital to soldiers of all nations.
There, he encounters the unworldly Doctor Malfeas and the beautiful but fierce Mademoiselle Brockenhurst, who seem to offer temporary respite from the horrors of war. Yet this former house of the holy holds many strange secrets and Dubois faces fresh battles on all fronts. In his own ranks against the surly Sergeant Sacleaux, his disgraced second-in-command, and externally, from a hostile countryside where every hand is turned against him. Yet most sinister of all is the malevolent mystery which lies at the heart of the Monasterio itself, an ancient and terrible enigma which threatens both the lives and souls of all who encounter it. Alone, deep behind enemy lines and beset on all sides, will Dubois survive his first independent command and can he prevent the horrible unravelling of the mysterious feast of the dead? "Epic, swashbuckling Napoleonic adventure expertly blended with chilling Lovecraftian horror." - Sci-Fi and Fantasy Reviewer