Some people feel disconnected from their true selves, and the world around them seems unreal, as if their life is happening to someone else. This condition, called depersonalization, is poorly understood and difficult to diagnose. It is known that it can be caused by trauma or severe stress, but in Russia there are very few specialists who work with this disorder and know how to treat it. This book by American psychiatrist Daphne Simeon and Australian journalist Geoffrey Abughel, who has lived with depersonalization for many years, is published for the first time in Russian. It details the clinical features, research history, theories of pathogenesis, and treatment methods for depersonalization disorder. The authors' work draws on the knowledge accumulated by the Mount Sinai School of Medicine and the Institute of Psychiatry at the University of Cambridge, and will be of interest to mental health professionals and people with depersonalization who are trying to understand their situation and find a path to recovery.