Ludwig Prinn's De Vermis Mysteriis was a book of arcane knowledge.

A 16th century German black letter edition of the book was in the collection of the Library of St John the Beheaded in 1887. Sherlock Holmes considered it a remarkably good copy. (PROSE: All-Consuming Fire)

Ace found a copy in Gilles Lemaitre's villa in Haiti in 1915. (PROSE: White Darkness)

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