This book certainly has a firm ground in the truth for all the 'what if' suggestions that inspired it. The whole Hitler/Raubal relationship has been the subject of countless speculations, and smutty click-bait articles posing as journalism. Wilde's cover story, of providing better fuel efficiency for the drive into Russia, was certainly a sore point for the Nazis, with their fuel draining and their supply lines stretching thin. What convinced less was the very fact of Wilde being chosen for the mission – the book is almost embarrassed to mention how implausible it would be to have a novice spy to try and get a wanted girl across Germany's borders, but it does mention it more than once, rather than resolve the issue. We get dripfed instead some past history of 'action', seeming anti-Germanic activity, and mention of boxing, all of which made me think this was a part of a series featuring Wilde I'd not been told about.