Also on Steam here.
Official short blurb about it:
In Mysteria Ecclesiae or “Mysteries of the Church,” Henry investigates a deadly affliction spreading within the Sedletz monastery, but the truth soon proves far darker. The church crypts have been disturbed; Teutonic guards patrol the halls, and intrigue seeps through every corner. To uncover the mystery, Henry must rely on his cunning, alchemical skills, and a fair bit of stealth. This cinematic new storyline introduces fresh quests, memorable characters, multiple endings, and new equipment including an outfit, weapon, potions, and books, all woven into a rich, investigative adventure.