The story of black and mixed race people in Nazi Germany who were sterilised, experimented upon, tortured and exterminated in the Nazi concentration camps. It also explores the history of German racism and examines the treatment of Black prisoners-of-war. The film uses interviews with survivors and their families as well as archival material to document the Black German Holocaust experience.

Fear and fascination arise in Muriel Grey when she remembers the figure of her father, who passed away when she was still very young. Thirty years after his death, Muriel will tell us the story of José Carlos Grey, a Black Holocaust survivor, freedom fighter in the Spanish Civil War and the French Resistance, and one of the only Black men known to have been imprisoned at the Mauthausen concentration camp in Austria.