'Michael Frayn's tremendous play is a piece of history, an intellectual thriller, a psychological investigation and a moral tribunal in full session' Sunday Times

'A profound and haunting meditation on the mysteries of human motivation' Independent

'Frayn has seized on a ral-life historical and scientific mystery. In 1941 the physicist Werner Heisenberg, who formulated the famous Uncertainty Principle about the movement of particles, and was at that time leading the Nazi's nuclear programme, went to visit his old boss and mentor, Niels Bohr, in Copenhagen. What was the purpose of his visit to Nazi-occupied Denmark? What did the two old friends say to each other, particularly bearing in mind that Bohr was both half-Jewish and a Danish patriot?... Frayn argues that just as it is impossible to be certain of the precise location of an electron, so it is impossible to be certain about the workings of the human mind... What is certain is that Frayn makes ideas zing and sing in this play' Daily Telegraph

Michael Frayn was born in London in 1933 and began his career as a journalist on the Guardian and the Observer. He has written seventeen plays, including Noises Off, Copenhagen, and Democracy, translated Chekhov's last four plays, and adapted his first as Wild Honey. His screenplays include Clockwise, starring John Cleese, and among his eleven novels are The Tin Men, Towards the End of the Morning, Headlong, Spies, and Skios. Collections of articles include Collected Columns, Stage Directions, and Travels with a Typewriter. He has also published two philosophical works, Constructions and The Human Touch, and a memoir, My Father's Fortune. His most recent publications are three collections of short entertainments, Matchbox Theatre, Pocket Playhouse, and Magic Mobile. He is married to the writer Claire Tomalin.