The Secret of the Night or Rouletabille and the Tsar (French: Rouletabille chez le Tsar) is a 1913 mystery novel by the French writer Gaston Leroux.

It is the third in his series of novels featuring the fictional detective Joseph Rouletabille, following on from The Mystery of the Yellow Room and The Perfume of the Lady in Black.

In 1905, Joseph Rouletabille is employed by Nicholas II of Russia to watch over one of his Generals whose life has been threatened by revolutionaries.

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