What happened behind closed doors at the October Plenary of the CPSU Central Committee in 1987? Why did Boris Yeltsin's speech stir the party circles and become a turning point not only in his fate but also in the history of the country? The tour will unveil archival secrets and transport you to the moment when a new era was being formed. The tour "Secret October: A Letter Without an Answer" is a deep dive into a little-known but fateful chapter of Soviet history. Boris Yeltsin, then still a party official, takes a step that will change everything: his speech at the October Plenary of the CPSU Central Committee in 1987 becomes the starting point of his path to the presidency of Russia. For a long time, this speech was closed to the general public. The transcript of the Plenary was not published for more than a year and a half. Why? The answers to this question lie in archival documents, many of which were discovered by the staff of the Boris Yeltsin Museum and presented in a new exhibition. The guide Artem Bardin - a researcher at the museum - will help reconstruct the atmosphere of political tension and reveal the true scale of those events. Where to go in Yekaterinburg, KudaGo knows.