Sequels are tricky things. The world that Le Guin created in a Wizard of Earthsea was so detailed and so perfect that you might reasonably expect the sequel to be 'more voyages of Ged around the archipelago'.
Instead Le Guin takes us to a totally different culture, a different worldview, a different language, a different place, and different main character.
This is the story of Tenar (or Arha) the priestess of the Nameless Ones, cruel spirits in a far flung but sacred spot of the Kargad Empire, known to us from the Kargad raid which begins 'A Wizard of Earthsea'.
There can be few sequels this good. Like its predecessor, this story is absolutely perfect - to the point at which when we first meet the wizard Ged, we see him with distrust through Tenar's eyes, even though we know him as our old friend Sparrowhawk.
This is a totally different kind of story, a totally different take on plot and person, pursuing a different line of philosophical and psychological enquiry.
If you enjoyed 'A Wizard of Earthsea' -, hey, even if you didn't, even if you've only just got into reading long books, - get hold of this, read it, love it, treasure it. You'll never look back.