The Book of Disquiet is one of the great literary works of the twentieth century. Written over the course of Fernando Pessoa's life, it was first published in 1982, pieced together from the thousands of individual manuscript pages left behind by Pessoa after his death in 1935. Now this fragmentary modernist masterpiece appears in a major new edition that unites Margaret Jull Costa's celebrated translation with the most complete version of the text ever produced. It is presented here, for the first time in English, by order of original composition, and accompanied by facsimiles of the original manuscript.