Why did Heisenberg travel to Copenhagen?
In 1941 Niels Bohr and Werner Heisenberg met in Copenhagen. The two scientists had been friends and colleagues working on quantum mechanics in the 1920s but had been separated by World War II. The meeting was a disaster. What was said between the men has puzzled historians ever since. In this play Michael Frayn imagines another meeting taking place in the spirit world where Heisenberg, Bohr and his wife Margrethe once again try to find the answers.