I'm searching for a book I read as a child in the mid 1990s. Might be older, but had more of a 1980s than 1950s feel to it. I read it in Swedish, but it was probably a translation from English.
I don't remember much of the plot other than that it was about a boy living in a bronze-age/Viking type village. (I think the book had a lot of Viking or Celtic themes.) He and his dad were messengers so they ran through the wasteland. They went on a mission together running to some other village bringing food in parcels.
I think later his dad disappeared during a message run and the boy began searching for him. At some point he found some remnants of a civilization/spaceship/beacon, probably in some cave/cliffs/mountains. It turned out they were the descendants of some space colonists but had degenerated as a society. Might also have been a rocket they found.
Something like that; it's a long time since I read it and I can't remember much more. 100-200 pages maybe.
I have read some similar questions and it is not one of the following:
- The Tripods - John Christopher
- Isis books - Monica Hughes