The Winter Queen is the first novel from the Erast Fandorin series of historical detective novels, written by Russian author Boris Akunin. It was subtitled конспирологический детектив.

The Turkish Gambit is the second novel from the Erast Fandorin series of historical detective novels by Russian author Boris Akunin. It was published in Russia in 1998. The English translation by Andrew Bromfield was published in 2005 as third of Fandorin novels, after Murder on the Leviathan which follows it in the internal chronology.