Feedback on idea

The idea of the characters walking, talking and finding the murderer would be a whole film but this is just an opening scene. Therefore, the whole idea of them just talking doesn't have a main focus, so putting the finding of a dead body in there could be more of a focus. However, I could change the idea by making the boyfriend a detective finding a serial killer and his detective girlfriend could be dead but he does not know she is as he can still see her. However, we wouldn't find out that she is a ghost until we see the dead body. I would show this with a long shot of the dead body in the distance and then a close up of it. As they rush over to the body I will then shoot another angle where it shows him talking to himself. The girlfriend would find a glove a couple of metres away from the dead body which would belong to the murderer  and that is when the opening scene will end. Looking more into the TV series, River has helped me develop this idea.