About 15 years ago I read the very well written memoirs of a 15th Air Force B-17 pilot. It was a library copy but it disappeared from the shelves not long afterwards. I'd love to seek out a copy
but I can't remember the title or author. I think he was based on one of the Foggia airfields. He and his crew baled out over Bulgaria after their B-17 succumbed to battle damage and ended up in a Bulgarian PoW camp. Not much to go on but maybe it rings a bell with someone.