Very well written, and with a seemingly authentic historical and cultural setting. Iceland in the 17th century was pretty well at its nadir. As if surviving at all in this harshest of natural environments wasn't hard enough, the autocratic and repressive rule of the Danish colonists made life even tougher. The social and political situation is very similar to that in Sjon's The Mouth of the Whale.
The Reformation caused as much upheaval here as it did in other parts of Europe, thanks in big part to the Danes' imposition of The Great Edict which enforced a puritanical and rigidly conformist regime on the unfortunate Icelanders.
Like religious fundamentalism everywhere, it led to persecution and injustice, as the main character, Gudmunder, finds to his cost. An intelligent lad from a poor background, who by the grace of a kindly patron secures an education, he is at once rash and naive, not always acting in his own best interest, and falling prey to the malevolence of powerful enemies. He was as afflicted as Job, but his constant complaint and self pity, though understandable, became a little wearing after a while.
I hovered between 3 and 4 stars here, but erred on the side of generosity, because it is unfair and unrealistic to expect that every writer can be like Halldor Laxness! (I am currently re-reading that absolute masterpiece, Iceland's Bell)