After returning from a year-long Moon mission, Cassie, a NASA botanist, finds herself in a remote cabin in the woods, where her estranged twin sister, Stella, a former NASA architect, has found a new life with climate activist Bryan. WALDEN, a debut play by Amy Berryman, directed by Ian Rickson (Jerusalem, Uncle Vanya), will star Gemma Arterton (Quantum of Solace), Fehinti Balogun (Juliet, Naked) and Lydia Wilson (The Duchess of Malfi) at the Harold Pinter Theatre.