Vivienne Franzmann 
The Witness (NHB Modern Plays) [EPUB ebook] 

A dark and penetrating thriller of modern morals, by the Bruntwood Prize-winning author of Mogadishu.
Captured in an award-winning shot, Alex was rescued from Rwanda and adopted by the man behind the lens. Years later, she's back from university, returning to the Hampstead home in which she was raised. As a long-hidden secret is exposed, the distance between father and daughter stretches taut.
The Witness premiered at the Royal Court Theatre, London, in June 2012.
'powerful, original and deeply moving' Telegraph
'a marvellous piece of writing, delivered with quiet intensity and not an atom overdone' Financial Times
'if there is a finer new play than The Witness this year, I'll be astonished' Evening Standard