The value of Gustav Janouch’s Conversations with Kafka was immediately recognized when it was first published in America in 1953. Through a series of mishaps, however, the original text did not include several large and critical segments of the manuscript. The missing material, only recovered by chance, was integrated in 1971 into this revised and enlarged edition of Janouch’s extraordinary portrait of Kafka. “The living Kafka whom I knew,” the author writes in his post-script, “was far greater than the posthumously published books, which his friend Max Brod preserved from destruction.…