John Steinbeck wrote The Grapes of Wrath during an astonishing burst of activity between June and October of 1938. Throughout the time he was creating his greatest work, Steinbeck faithfully kept a journal revealing his arduous journey toward its completion. The journal, like the novel it chronicles, tells a tale of dramatic proportions—of dogged determination and inspiration, yet also of paranoia, self-doubt, and obstacles. It records in intimate detail the conception and genesis of The Grapes of Wrath and its huge though controversial success. It is a unique and penetrating portrait of an emblematic American writer creating an essential American masterpiece.