In April 1965, Che Guevara set out clandestinely from Havana to Congo to head a force of some 200 veteran Cuban soldiers to assist the African liberation movement against Belgian colonialists, four years after the assassination of the democratically elected socialist president of Congo, Patrice Lumumba.

This diary deals with what Che admits was a "failure," and he examines every painful detail about what went wrong in order to draw constructive lessons for planned future guerrilla movements. Unique among his books, Congo Diary gives us Che's brutal honesty and his story-telling ability as he recounts this fascinating episode of guerrilla warfare unblinkingly and without sugar coating or jargon. Considered by some to be Che's best book, it is also one of the few that he had a chance to edit for publication after writing it.