Hapgood

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Hapgood is a play by Tom Stoppard, first produced in 1988. It is mainly about espionage, focusing on a British female spymaster and her juggling of career and motherhood. The play also makes reference to quantum mechanics, including Niels Bohr's "The answer is the question interrogated"; Heisenberg's uncertainty principle; and the topological problem of the Seven Bridges of Königsberg.
In the original production in 1988, Felicity Kendal played Hapgood and Nigel Hawthorne played her friend and superior Blair. The production was a critical failure, and it was revised significantly in 1994 for the first New York production.