The monograph is a book about one of the most popular and, in parallel, the most complex types (or genres, as some researchers believe) of journalism. He has been almost two centuries old. During this time, journalistic investigation developed, improved, acquired its own signs and its own position in the media. Considerable experience has been accumulated. Therefore, we are talking not only about methodology and practice. Therefore, such attention is paid to the history of the species (or genre), its features formed in many years of practice. The tutorial is also designed to help you learn how to work with information sources within the framework of professional ethics. Evaluate them in terms of reliability and reliability. It is impossible to learn much else, without which even today, in the days of "instant journalism" and "omnipotence" of new technologies, high-quality journalistic investigation is impossible as material about events or phenomena that some people or organizations wanted to keep secret.