In April 1945, as Nazi Germany is on the brink of defeat, the Swedish Red Cross launches the largest rescue operation of World War II. The mission – arranged in secret between a Swedish aristocrat and Adolf Hitler’s right-hand man, SS chief Heinrich Himmler – ultimately saves 15,000 prisoners from Nazi camps. One of the destinations is Ravensbrück, the main concentration camp for female prisoners, where thousands of women are evacuated onboard Sweden’s now-iconic “White Buses”.