The author analyses relations between an investigative journalist and his confidential source in context of the Watergate scandal. The special attention was turned to protection of a confidential source of information by journalists. The author focuses on nature of leaks, the uncontrolled way in which secret information gets out from political institutions. Numerous attempts are described, undertaken by journalists, scholars and politicians of disclosing identity of the most mysterious source of information in the history of American investigative journalism.