My first published book was Crypt of the Vampire. That was before the Soviet Union fell. A couple of years ago I reworked it as an Alexa app (Amazon call them skills, but apps is what they are) but it never saw the light of day because the coder lost interest. Eventually -- by which I mean after I've finished Vulcanverse book 5, Jewelspider, Tetsubo, Abraxas and Λ -- I'll release that revised version as a book.
But you don't have to wait that long for some sinister vampiric thrills, because Red Ruin Publishing have unleashed another of their top-notch free Dragon Warriors solo adventures, Lair of the Vampire, set in Hudristania, where:
"...tiny villages squat miserably in the isolated mountain passes, like birds’ nests huddled into a crag for shelter. Frightened peasants quake under the rule of a hundred local despots. Terror soars aloft on membraneous wings by night and sifts the carrion in lonely churchyards—for this is the traditional home of vampires, ghouls and werewolves. Black-clad priests trek from valley to valley, but the peasants are always torn between faith and fear. Spend a few days in any of the mountain villages and you will see a funeral procession wending a path down through the narrow streets—old men whose lined faces show the scars of many losses, grim youths with jaws set in sullen defiance, veiled women sending up a shrieking lament, and wailing children who have yet to learn the injustice into which they have been born. The mourners are led by a priest with a silver crucifix on his breast. Watch and wait. After the procession has gone past, once the wailing and the clanging of the priest's bell have faded into the distance, you may see another figure pass by. He follows the mourners at a respectful distance, his eyes showing only a weary determination. On his back he has a heavy knapsack. After the coffin has been lowered into the ground, the priest will linger to pay this man a few silvers before hurrying back with the other villagers to bolt his door. The stranger opens his knapsack and prepares the items he will need. He is a draktoter, a profession that combines gravedigging with another unpleasant duty. He takes the mallet and stake from his sack and turns towards the open grave. It is his job to see that the ranks of the nosferatu will not be joined by this unfortunate soul."