In April 1945, 75 white buses left Malmö, Sweden, and drove into a collapsing Germany to pull prisoners out of concentration camps, eventually freeing between 15,000 and 20,000 people. Marianne Prager retraces the journey her mother, Ruth Toronczyk, made after eighteen months in Theresienstadt: the goods wagon, the shaved head, the hunger, and finally a seat on one of those buses. The film follows Prager through the sites her mother passed through as she pieces together how a young Danish woman survived, and lays out how the rescue happened at all. Count Folke Bernadotte, a nephew of the Swedish king and a senior Red Cross official, negotiated directly with Heinrich Himmler to secure the buses' passage, an alliance between a humanitarian mission and the head of the SS that the film treats with the discomfort it deserves. Archival footage and Prager's present-day journey run side by side, recovering an operation that saved thousands of Danish Jews from Theresienstadt alone but has largely dropped out of popular memory of the war.