Robert S. Mueller & Special Counsel’s Office U.S. Department of Justice 
The Mueller Report: Report on the Investigation into Russian Interference in the 2016 Presidential Election [EPUB ebook] 

The Mueller Report is the official two-volume report presenting the findings and conclusions of Special Counsel Robert Mueller’s investigation into Russian efforts to interfere in the 2016 United States presidential election, allegations of conspiracy or coordination between Donald Trump’s presidential campaign and Russia, and allegations of obstruction of justice.
The first volume of the report focuses on Russian interference in the 2016 presidential election. Robert Mueller provided evidence which argued that Russian government had sabotaged the presidential campaigning of the Democratic candidate, Hilary Clinton.
In the second volume Muller addresses the cases of obstruction of justice made by Trump and his associated.