The Grey is not based on a novel. According to IMDb: Writers: Joe Carnahan (screenplay), Ian Mackenzie Jeffers (screenplay) and Ian Mackenzie Jeffers (short story "Ghost Walker") motionempire.com/Watch_The_Grey_-….
I don't think it's based on a novel, but you could find out at IMDB. They have all the info you need there!
Its based on the short story "GHOSTWALKERS" written by Ian Mackenzie Jeffers.
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.