Idea-
The theme of the film is going to be appearances and the words 'don't judge a book by its cover' will come into play. The film is going to be about an old man and his wife, it is going start of showing the elderly man going about his business, doing what old people do. (Prepare meals, shopping, making tea etc) But as night falls it is revealed that the man is/was a high ranking Nazi officer. It is revealed via him leaving his wife who is in bed and entering another room and opening  a box full of memorabilia, the shot would then cut to black and the title.  

Sound- a letter will be read out whilst the visuals are playing, the letter will sound normal and light hearted until night, when night falls the context of the letter would start to reveal that he is a Nazi.
The soundtrack over it would be a slow,soft piano.

The idea is just rough, if we decide to use it we will further refine it down to create more of an impact.