An undated photograph of Franz Kafka.Credit...Courtesy the National Library of Israel During his lifetime, Franz Kafka burned an estimated 90 percent of his work. After his death at age 41, in 1924, a letter was discovered in his desk in Prague, addressed to his friend Max Brod. “Dearest Max,” it began. “My last request: Everything I leave behind me . . . in the way of diaries, manuscripts, letter