Translation of Estonian volume \"Inglise luurajana Eestis\" (Eesti Ekspressi Kirjastus, 2001). The autobiography of the English spy Mart Männik (1930 1998) is a unique document. He had fallen into the KGB s hands who turned him round from the British secret service. He was a victim of MI6 s unsuccessful operations in Estonia in the years 1951 1955. The KGB counter espionage played with the British as a cat with a mouse. Mart Männik, or as an agent codenamed Otto, paid with a wrecked life for the gross mistakes of the British intelligence secret service.