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It's the year 1900. Sherlock Holmes and Dr. Watson receive an urgent commission from the Prince Regnant of Bulgaria to come to Sofia. The Codex Zographensis, the most ancient and most sacred manuscript in the Old Bulgarian language has been stolen. Its disappearance could lead to the outbreak of war between Russia, Austro-Hungary and the Ottomans, three ageing empires disintegrating like great suns on every side of the Balkans. What follows is an extraordinary story of duplicity, murder, vampires and greed for vast estates in Bulgaria and Hungary, with the fate of millions in Sherlock Holmes' hands.
The events in Sherlock Holmes And The Case Of The Bulgarian Codex are fictional but the principal character, 'Foxy' Ferdinand is based on the real Coburg Prince Regnant, later Tsar, who ruled Bulgaria from 1887 until his forcible abdication after joining the losing side in World War One.