
Grossman wrote this work later, and never finished it (still working on it at time of his death). He's exploring a number of events and themes; perhaps not entirely pulled together; but always coming back to "freedom".
The main character (Ivan Grigoryevich) returns to Moscow after 30 years in the camps - this was after Stalin's death, after Khrushchev's denunciation, when quite a few camp survivors were freed. This led to some difficult meetings with folks that had managed to avoid the camps - typically via denunciations and other forms of collaboration. These folks feel intense guilt; but Grossman includes concepts showing lots of sympathy for folks in the impossible circumstances in which all tried to survive.
Chapters on the starve-out of the Ukrainian kulaks and on the conditions in the women's camps in Siberia are presented in a very matter-of-fact manner; but graphic and almost painful to read.
Grossman concludes with a discussion of Lenin, Stalin, the 19th century Russian writers who perceived Russia as having a "great soul" that would end up leading the world (in comparison to decadent Europe and money-chasing US) - this part is pretty interesting. That Stalin was basically a new Tsar with a better-organized secret police force; that Russia had a 1000 year history of slavery that facilitated 20th century totalitarianism.
So the book is pretty much very heavy duty but with an underlying affirmation - maintained in the face of all contrary evidence - about freedom as man's essential condition.
For folks that went through these events, those concepts must have levels of meaning about which we cannot have a clue.