Folks:
I inherited a lot of fascinating books from my father, many to do with aviation - mostly fact, but a few fiction as well. One that I particularly loved as a kid was called 'Secret Squadron' (probably not its title in the USA) by Laurence La Tourette Driggs. It told the adventures of a First World War American ace, Arnold Adair, and a number of German-speaking pilots flying captured German two-seaters, the idea being that they would land at various German airfields, mingle with the other aircrew and thus gather intelligence... real spy-stuff, very well-written and hugely enjoyable.
I believe there was a whole series of Arnold Adair stories, but this is the only one I've ever come across. Does the name still ring a bell in the memories of any aged aviation enthusiasts over on your side of the pond?
Regards
John