Hollywood, the Cold War is in full swing. While at the top of his art, screenwriter Dalton Trumbo is accused of being a communist. With other artists, he quickly becomes untenable, then imprisoned and placed on the Black List: it is now impossible for him to work. Thanks to his talent and the unconditional support of his family, He will bypass this prohibition. By leading a long battle in the shadow towards his rehabilitation, he forges his legend.