It was probably Helga Michnowski and her son Michael, later known as Ursula and Thomas Wagner: https://web.archive.org/web/20060213155527/http://www.myspystory.

It was probably Helga Michnowski and her son Michael, later known as Ursula and Thomas Wagner: https://web.archive.org/web/20060213155527/http://www.myspystory.com/intro.html https://web.archive.org/web/20060213155527/http://www.myspys... If you can read German, Werner Stiller, the Stasi agent who was involved in this story, wrote a detailed account in the following book: "Der Agent: Mein Leben in drei Geheimdiensten". Also in German: https://www.youtube.com/watch?v=-vVYu2HaX10 https://www.youtube.com/watch?v=-vVYu2HaX10 An account in English from Werner Stiller's son: https://www.youtube.com/watch?v=Y30yDu7_JBU https://www.youtube.com/watch?v=Y30yDu7_JBU