The rain had left Munich slick and gray, and the university corridors smelled faintly of wet stone and coffee. Dr. Catrina von Dietingen sat hunched over a stack of student essays, red pen in hand, when a knock rattled her office door. Without waiting for an answer, Professor Heinrich Keller shuffled in, his scarf trailing behind him like a forgotten banner.

        “Busy, as always,” Keller said, lowering himself into the chair opposite her desk. He coughed, fished a folded letter from his coat pocket, and placed it carefully on top of her papers. “This came to me, but it belongs to you.”

        Catrina raised an eyebrow. “Another invitation to a conference? I’ve barely recovered from the last one.”

        “Not a conference.” Keller tapped the letter with a crooked finger. “An estate inventory. Castle Schwendstein, in Bavaria. They’re opening the library.”

        She sighed, uncapping her pen again. “Estate inventories are glorified auctions. Dusty ledgers, forgotten hymnals. Hardly worth the trip.”

        Keller leaned forward, his eyes gleaming. “Not this one. They mention the Codex Tenebris. Do you know what that means?”

    Catrina paused. The name stirred faintly in her memory—something she had skimmed in a footnote years ago.

        “A manuscript rumored lost during the Counter-Reformation. But rumors are cheap.”

       “Rumors,” Keller said, “are the bones of history. This codex is said to contain marginalia—illustrations of executions, notes on heretical rites. If it exists, it could rewrite our understanding of Bavarian heresy.”

        Catrina pushed the letter aside. “And you think they’ll let me see it?”

        “They’ve invited scholars. The Baron is old, eccentric, and apparently eager to have his holdings catalogued before the castle crumbles around him. You’re the best suited for this—your work on liturgical manuscripts, your eye for marginalia. It’s practically calling your name.”

        She laughed softly. “Or calling for my time, which I don’t have.”

        Keller’s expression softened. “Catrina, you’ve spent years chasing fragments. This is a whole text. Don’t dismiss it because it comes wrapped in dust and superstition.”

    She unfolded the letter. The handwriting was formal, the ink slightly faded. It listed train schedules, accommodations in the village below the castle, and a polite warning: The Baron is frail, but insists on meeting all visitors personally. The manuscript is kept under lock in the castle library. Scholars are advised to prepare for unusual conditions.

        “Unusual conditions,” she murmured. “That sounds promising.”

        Keller smiled. “Promising, or ominous. Either way, it’s yours to discover.”

    Catrina set her pen down, staring at the rain streaking her office window. The essays could wait. The codex could not. She folded the letter again, slipping it into her bag.

        “All right,” she said. “I’ll go to Bavaria. But if it turns out to be another dusty hymnal, you owe me a month of grading.”

        Keller chuckled, rising slowly from the chair. “Deal. But I suspect you’ll find more than dust in Castle Schwendstein.” ...

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