For their adaptation of Nico  Walker’s semi autobiographical novel — their gritty follow-up to the ground and record-breaking ‘Avengers: Endgame’ — directors Joe  and  Anthony  Russo honed in on addiction and PTSD, tapping their younger sister, Angela Russo-Otstot, to co-write the script in this family affair.

Source: How the Russo Family Switched From Superheroes to America’s Opioid Crisis With ‘Cherry’