In late summer 1953, as he returned to Mexico City after a seven-month expedition through the jungles of Ecuador, Colombia, and Peru, William Burroughs began a notebook of final reflections on his four years in Latin America. His first novel, Junkie, had just been published and he would soon be back in New York to meet Allen Ginsberg and together complete the manuscripts of what became The Yage Letters and Queer. Yet this notebook, the sole survivor from that period, reveals Burroughs not as a writer on the verge of success, but as a man staring down personal...