In the aftermath of the Reichenbach Falls, Sherlock Holmes moves unseen through Europe, officially dead and dangerously free. But anonymity proves short-lived. Detained at the Russian border and unmasked by the Okhrana, Holmes is forced into the service of the Tsar’s secret police with a stark choice: cooperate, or disappear into the salt mines of Siberia. A Celestial Mystery is a lost case from the hidden years of Sherlock Holmes—an elegant and unsettling tale of coercion, creativity, and conscience, where deduction collides with tyranny and the faintest notes of beauty may decide a man’s fate.