Beloved Kiwi director Taika Waititi, who has become a household name thanks to “Thor: Ragnarok,” brings his skills to this quirky story of a young German boy in Nazi Germany whose imaginary friend is an ethnically inaccurate version of Adolf Hitler who pushes the kid’s naive patriotic beliefs. He soon discovers that his family is hiding a Jewish girl (Thomasin McKenzie) in their house, one who also challenges his views. With Waititi playing der Fuhrer, it’s obviously going to have a touch of the absurd and could yield something quite hilarious. Yet the Christine Leunens’ novel “Caging Skies” which serves as the source material is fairly serious and considering we’re also in a time when fascism seems to be on the rise again around the world, what was farcical a decade ago nowadays seems borderline possible and therefore frightening so getting the tone right will be key. Scarlett Johansson, Sam Rockwell, Rebel Wilson, Alfie Allen and Stephen Merchant co-star.