The Comedy Theatre is where Knightley made her West End debut last year in The Misanthrope. She plays Karen Wright, and Moss plays Martha Dobie, who together run a girls’ boarding school in 1930s New England, where they become entangled in a story of deceit, shame and courage when a schoolgirl's whispers spread.
Further casting will be announced shortly. The play is being produced by Sonia Friedman Productions and Scott Landis. It is directed by Ian Rickson.
To book tickets, which are now on sale, contact the box office on 0844 871 7622, or visit www.ambassadortickets.com/comedytheatre.