Under Stalin, it was inconceivable that anyone could publish a book attacking Soviet injustice. But under Khrushchev, a limited but distinct thaw has taken place. Prime evidence of this change was open publication of One day in the life of Ivan Denisovich, an exposé of Stalin's labor camps where the author, Alexander Solzhenitsyn, himself did time. Tonight's adaptation of the novel is set in 1951 in Siberia. A group of prisoners persuade the authorities to transfer them to warmer work by promising to top the previous work record on the first day. But if they fail, it's back to laying barbed wire in the snow. One officer, Lieutenant Volkovoi, would like nothing better.