Deadly Decision (1954)

Admiral Canaris is chief of the intelligence service of Nazi Germany. His department is quite successful and Hitler grants him all the money he wants for new developments. Still he's a thorn in the side of the Nazi chiefs, since he's not as unscrupulous as they want him and is known to criticize their ideology. Irene Heydrich is blackmailed to spy on Canaris just while he starts planning an attempt on Hitler's life.