One Day in the Life of Ivan Denisovich is Aleksandr Solzhenitsyn's classic description of life in a Soviet labor camp in the 1950s, describing a single day of an ordinary prisoner, Ivan Denisovich Shukhov. Seemingly as much known for its actual publication (a significant event in Soviet literary history), it's also a cracking read.

Essentially an exploration of authoritative oppression and camp survival, Solzhenitsyn used his first-hand experience in the Soviet Gulag, having been imprisoned from 1945 to 1953 for criticising Joseph Stalin.

Oddly enough, for the subject matter One Day in the Life... is actually an uplifting read. I'd very much recommend it to anyone.