The book written about his life as a spy called The Catcher Was a Spy by Nicholas Dawidoff. Shooting Heisenberg would have been a very serious step, because the U.S. embassy in Switzerland was key to acquiring intelligence about Nazi Germany and especially about their progress in developing an atomic bomb. Several scientists escaping the Nazis in the 30s emphasized that Germany at their departure was well on the way to developing the atomic bomb, and well ahead of the British and Americans. Albert Einstein sent a confidential letter to FDR warning that the Kaiser Wilhelm Institute for Physics had been taken over by the military, and that a nuclear chain reaction in uranium could lead to construction of a bomb of enormous power. Germany had acquired Europes only uranium mine when subjecting Czechoslovakia. After conquering Europe, the Nazis placed Norways heavy-water plant at Rjukan under I.G. Farbens control with the directive to vastly increase its output, which the cartel did by increasing its budget 1000%. Defeating France in June 1940 meant the Germans obtained control of Europes only cyclotron.
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My Dad always claimed that Ike slowed down Patton's invasion of Germany proper intentionally because FDR was fond of Joe Stalin and wanted to give the Red Army time to grab their share of German occupied territory.
Thus, the allied armies in the west were essentially halted along the Ardennes line in October 1944 while the Red Army was allowed to advance in the east. Part of the reason for the pause was, of course due to the Allied fiasco with Operation Market Garden, but Patton's third army could have driven north (as it eventually had to do in the Battle of the Bulge) if the supply line logistics had been available at the time.