This (The Broken Sword) is a novel I read many years ago (back in the 1980s). I've read it several times since. I think it was originally published in the 1950s or maybe 60s.
In anycase I just finished listening to the audiobook version and was very pleased. The first 10 minutes were kind of dull (introduction) but after that, went well. The style of writing, with description of weather and scenery are excellent. It does not fit today's pattern of front loading action, as there is a bit more set-up, but the payoff is worth it. The narration fit the characters and emotions--right on target.
The story is about Skaflock, a human stolen as a foster child by an Elf Earl, and a changling is left his his place (Valgard). The storyline follows the two individuals, one good, the other evil as they grow and come into conflict to the backdrop of a war between the elves and trolls, with the Norse gods playing a hand.