"Three Case Histories" is a compilation of three of the most famous case studies by a renowned psychoanalyst, exploring the complexities of the human mind. The book includes the cases of 'Little Hans', a boy with a phobia of horses, 'The Rat Man', an obsessive-compulsive patient, and 'The Wolf Man', a wealthy Russian aristocrat suffering from a variety of psychoneurotic symptoms. The author uses these cases to demonstrate his theories on psychoanalysis, childhood sexuality, the interpretation of dreams, and the subconscious.

This book delves into the concept of repression, a fundamental aspect of psychoanalytic theory. The author explores the idea that individuals often repress memories, particularly those associated with trauma or discomfort, pushing them into the unconscious mind. This repression, however, can lead to various psychological issues such as anxiety, depression, and neurosis. The book also discusses the therapeutic process of making the unconscious conscious, enabling individuals to confront and deal with these repressed memories.