Only two large collections of Hildegard of Bingen's music are extant, today housed in the Katholieke Universiteit in Leuven (B-LVu, no shelf number) and in the Hochschul-und Landesbibliothek RheinMain in Wiesbaden (D-WI1 2, the so-called ‘Riesencodex’). The Riesencodex, though, was almost lost during World War II. It survived both bombing and plundering in Dresden in February 1945, only to be appropriated by the Soviet Administration in 1947. Using archival records from the Hessisches Hauptstaatsarchiv in Wiesbaden from the 1940s and 1950s, I detail the efforts of a number of people to retrieve the manuscript after the war and bring it back to Wiesbaden. Franz Götting, the director of the Wiesbaden library, spent several years trying to recover the manuscript through official channels. Its eventual return to Wiesbaden in 1948, however, came about surreptitiously, largely through the efforts of Margarete Kühn at the German Academy in East Berlin and an American woman, Caroline Walsh, in Berlin as a military spouse.