Based on real-life events, the drama follows Ruth Wilson’s grandmother, Alison, who believes she is happily married to acclaimed author and former spy Alexander ‘Alec’ Wilson until he dies unexpectedly in 1963.
Then another Mrs Wilson turns up on Alison’s doorstep, claiming to have also been married to Alec.
“Alec was a British spy and a best-selling novelist… but what else besides?,” said the BBC in a statement. “Where did his truth end and his fiction begin? Alison will be pushed to the very brink to find out.”
Of the BBC1 drama, Wilson says: “I am so excited to bring to the small screen the extraordinary lives of my grandparents.
“Theirs is a profoundly moving story.”
This article was originally published in July 2018. Updated September 2019.