For a year Sasha Denisova didn’t tell her mother, Olga, who lives in Ukraine, that she had written a play about her. When director Yury Urnov made plans to stage it in the US, Denisova vowed to herself every month: “I need to tell my mama. I need to tell my mama. I need to tell my mama.” Finally, once Denisova arrived in Washington DC, 82-year-old Olga posed the question: what was she doing there? “I told her, ‘Mama, dear, please don’t worry. I wrote a play about you and myself. I tried to do a good job with this....