The correspondence of Sigmund Freud with his close friend and interlocutor Wilhelm Fliess opens a unique window into the inner journey of the founder of psychoanalysis. Through letters, essays, and notes from the period 1887-1902, the reader follows Freud's intellectual and personal development: the painful and exhilarating process of self-analysis, scientific pursuits, and theoretical discussions that would lead to the birth of a new science.

The book vividly depicts the atmosphere of Vienna at the end of the 19th century, the dialogue between psychology and literature, neurophysiology, and philosophy, as well as Freud's deep personal need to understand the human being beyond any conventional approach. A foundational work for understanding not only psychoanalysis but also the very intellectual history of modernity.

The edition is accompanied by a thorough introduction and editorial commentary that illuminate the historical and theoretical context of the texts, making the book valuable for researchers, mental health professionals, and any reader interested in understanding Freud from the inside.