The Kremlin. Behind its red brick walls, how many plots, mysteries, crimes, and betrayals has the famed Moscow fortress borne witness to? For nearly a century, it was both the center and the symbol of the Communist Empire founded by Lenin, and restored, somehow, by Putin. How many questions, shadows, interrogations, and taboos remain behind its towers? Who killed Rasputin? How did Tsar Nicholas II die? How did Stalin assassinate Trotsky? Who were Kravchenko, Andropov, and the "Farewell" spy, really? How were de Gaulle and Mitterrand received by the Russian leaders? Where does Vladimir Putin come from? And, last but not least, what are the real motives of his war in Ukraine?