Mr. Emmanuel [1944] [DVD]

Felix Aylmer is Isaac Emmanuel, an elderly Jewish British subject who goes to Germany to find what happened to the mother of refugee Peter Mullins. He is seized by the authorities, imprisoned, and accused of being part of an international murder ring. He is saved when Greta Gynt, an entertainer he had befriended as a child, who is now the mistress of a high-ranking Nazi, pressures her lover into having him released.

This was Aylmer's only starring role out of almost 140 movie appearances. ~ imdb