The idea for a potential story idea I'm working on involves Nazi's. The first idea is that he's a Nazi Scientist slash SS soldier that worked directly for Hitler. Then Hitler double crossed him and he turned traitor and helped to bring down The Third Reich (Which he helped build) and after killing Hitler he vanishes. The second idea involves the same story I mentioned before but it takes place in modern times and what I've already mentioned is more of secret history that is slowly revealed. But I'm not sure which is better. I feel it's better to treat it as a secret so I can better explain the main characters motives in that time period.