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UFOs Before Roswell: European Foo Fighters 1940-1945
It's not really a new book (I made this video a while back!) but "UFOs Before Roswell: European Foo Fighters 1940-1945" is probably the most detailed single source of information regarding UFO activity in Europe during WW2 that has ever been written. From early sightings in Occupied Belgium in 1940 through to strange aerial objects over Germany at the end of April 1945, it's all here... the book is available via Amazon, see the link below:
See more (external link) 
https://www.youtube.com/watch?v=sVfs0jdlXCg