This is a hungarian paperback. The inside contents listed two ISBNs. Not being able to translate the Hungarian words beside the two numbers, I just guessed at the one I listed. The other is 9637403426. I reiterate that this is a paperback edition.
Like Feladat this one is also set on a pre-historic planet with a crash-landed space ship. It was also the recurring fantasy of my childhood so I can understand Peter Zsoldos writing more than one book on the subject. (Who am I kidding — it is still my recurring fantasy.) This book is less focused on personal morality and rather deals with matters involving civilizations.
I have read it many years ago, but will try to recall a short plot summary.
Historical fiction meets science fiction. The initial idea of putting a 25th century space traveler into the bronze age Mediterranean world is quite daring in and of itself. Note, that up until the end the world remains a distant planet, no relation to our actual past is revealed, only a close resemblance, which includes the smallest detail. However, apart from this major annoyance, the book is quite well written, exciting and entertaining.