The real story of Oberstrurmfuhrer Morgen
Morgen and a team of Kriminalpolizei officers were sent from Berlin to Lublin, following information sent by Johannes Muller, commander of the Sicherheitspolizei in Lublin, who had heard of a Jewish wedding at a camp attended by over 1,000 guests, including members of the SS.
Morgen’s enquiries led him to a camp – described to him in Lublin as “impenetrable and mysterious” – this camp was the death camp at Sobibor where he found Wirth.
http://www.holocaustresearchproject.org/trials/konradmorgen.html