AtelevisionadaptionofMichaelFrayn'scelebratedandaward-winningstageplayaboutthemeetingbetweenphysicistsNielsBohrandWernerHeisenbergin1941Copenhagen.AtthistimetheyoungHeisenbergwasleadingafalteringGermanreseachprogramintonuclearenergy,whilethemiddle-agedandapparentlyisolatedBohrwasincontactwithalliedagents,andstillheldapositionofgreatinfluenceinthenuclearphysicsresearchcommunity.AfterthemeetingthetwomenputdifferentinterpretationsimpressionsofwhyHeisenbergrequestedthemeeting,andwhathehopedtogainfromit,athemewhichmirrorstheambiguityofthe"Copenhagen"interpretationwidelyusedinquantumphysics.DidHeisenberggototheavuncularBohrtoseekinghisblessingforhisroleinnuclearresearch?WhydidHeisenbergconcentrateonthedevelopmentofanuclearreactor,andnotperformthecalculationsthatwouldshowthatabombcouldbemadetoworkviaafast-neturonreactioninUranium235.Theseandotherquestionsfeatureintheplot,althoughunsurprisinglytherefewcertainanswers.