of the Master Spy That Helped Win World War II (1976, 2000)
Bohr was told that he needed to go to the US to help build the atomic bomb, but Bohr balked, stating that he couldn't be part of something that was inherently violent. It was the same old story: Bohr was back in his Scientific Ivory Tower refusing to see the reality of World War II . . . but eventually Bohr agreed to "join the team". In late-1943, Bohr and Aage flew to NYC, provided with false ID papers under the name of Baker, a name that Bohr could remember, having never remembered any of his previous false names (he even answered the phone "Bohr here"); Bohr was now part of the Manhattan Project.
There were those (including Churchill) that believed Bohr, while in Nazi-occupied Denmark, had come close to committing a moral crime against all of humanity, and some of them were in the US working on the Manhattan Project. As far as FDR was told, Bohr proved to be more of a liability than an asset to the Manhattan Project, and the President actually decided to sent Bohr back to London.
Bohr pleaded that his lab be left alone, and that his Van de Graaff generator that he used in heavy water experiments be left alone, so the Nazis wouldn't be alerted to its importance, and the planners of the operation agreed. After much debate, it was decided that Bohr's lab in Copenhagen would not be destroyed (Bohr was aware that the Danish Resistance had placed explosives under his lab). However, Danish prisoners held at Gestapo HQ knew how important Bohr's work was to the development of the atomic bomb, and British Intelligence knew that all prisoners talked in the end, unable to indefinitely endure torture.
It was determined that the Royal Air Force would give the air raid a go. Christian X's emissary even provided the RAF, upon their request, a photograph of the building at wave-top level. Civilian lives would be lost in the raid, and not just prisoners in Gestapo HQ; having decided that there was no other alternative but to risk collateral casualties, 18 Mosquito bombers were re-tasked from other raids in Europe to bomb Gestapo HQ in Copenhagen.
P-51 Mustangs provided air cover for a time under a Belgian commander.
The 18 Mosquitoes took the Germans in Copenhagen completely by surprise; German efforts to camouflage Gestapo HQ actually made it easier for at least some of the British pilots to spot and hit the building. As almost always with military planning, the operation ran into problems: one of the Mosquitoes crashed into a nearby school, which meant that pilots coming in later would have difficulty finding their real target, and some didn't drop their bombs as a result. The cost in human life for saving (and killing some) Danish Resistance prisoners were 10 airmen, 27 teachers, 87 children, with many more civilians wounded. But 30 Danish Resistance prisoners escaped and the Gestapo's files at HQ were destroyed. WS was in the process of preparing a detailed report of the air raid to FDR, but the President died of natural causes on 12 April 1945, and WS never sent the report.