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'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...