It is September 1941. German physicist Werner Heisenberg is visiting his friend and former colleague, Danish physicist Niels Bohr at his home in Copenhagen. Denmark is occupied by the Third Reich, and both men are under surveillance by the Gestapo. What is the purpose of their meeting at this charged time? Did they confer about the potential to build weapons based on the emerging knowledge of nuclear fission? Did Heisenberg wish to warn Bohr about the growing threat to Danish Jews? These questions and more are explored in Michael Frayn’s absorbing play Copenhagen. I’m delighted and honoured to be joined in this episode by the playwright himself.