Inkaindianernas fångar (Prisoners of the Incas) by Gustaf Bolinde - there's actually a whole genre of captivity narratives - one of the oldest is from the 1680's! I was a little fascinated by them as a kid - a fair number of them are the supremely, unquestionable accurate "based on a true story" type books that are absolute works of fiction, but they were engrossing to a little kid.
https://en.wikipedia.org/wiki/Captivity_narrative