What is the theme in Journey Into the Whirlwind by Eugenia Ginzburg?

The human spirit is another theme in the story. The will to prevail against odds through the human spirit is the overarching and dominant theme of Ginzburg's book "Journey into the Whirlwind." Faced with unspeakable cruelty -from punishment cells, withholding of rations, lack of medical care, brutal interrogation methods, and hard labor without adequate shielding against the Siberian winter -Ginzburg and the others must look inside themselves and to each other to survive.