The Otto Weininger Case: A Psychiatric Investigation is an interesting and insightful work by author Ferdinand Probst. The book reveals the fate of the famous Austrian philosopher Otto Weininger through the prism of psychiatric analysis. Probst examines not only the life and work of Weininger, but also pays attention to his inner psychological barriers and conflicts. This book allows the reader to look into the depths of the human psyche and understand the essence of the figure of Otto Weininger from the point of view of psychiatry.