“The mentally healthy in the place of the crazy” is how David Rosenhan, a professor of psychology and law at Stanford University, called his revealing article. Before him, journalists and psychiatrists had repeatedly infiltrated psychiatric institutions undercover, but this was the first time such an operation was carried out on such a large scale and was accompanied by the collection of detailed empirical data, and its result was publication in the main scientific publication Science. Rosenhan’s research became “a sword pierced the very heart of psychiatry”: undermined its authority, caused fierce discussions in psychiatry circles and influenced the formation of a new system for diagnosing mental illnesses. Its significance is difficult to exaggerate, but decades later, when there were almost no living witnesses to the famous experiment, Suzanne Cahalan took up the investigation of Rosenhan's story. She was pushed along this path by another “great pretender” - autoimmune encephalitis, a disease whose symptoms mimicked schizophrenia and bipolar disorder. but were caused by physical reasons - obvious dysfunctions of the body. For Suzanne, turning to Rosenhan's experiment is an attempt to answer the main question for her, which the researcher himself asked: if sanity and insanity exist, how can we distinguish them from each other? The publishing layout of the book is saved in PDF A4 format.