I've been reading recently books on the former Soviet Union. "Beria, my Father" by Sergo Beria, "Krushcev" by William Taubman, "Conversations with Molotov" by Feliks Ciuev...
Then tried "Stalin's Daughter: The Extraordinary and Tumultuous Life of Svetlana Alliluyeva" by Rosemary Sullivan but could't finish it. Compared with the 'bad guys' her biography is just dull.