It's a difficult one if there are no credible witnesses. Are there any businesses in the area? Maybe one of them has a security camera pointing in that direction that might've captured the activity.
In some parts of the world where scams are rife, such as in Russia, people are using dash-cams to record everything that goes on in front of them.
He drove off from the place it happened and you followed... he has no case. If he had stayed and not left the scene of the accident (a criminal offense) he would have had a chance even with your partner in the car.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.