Warbreaker

Great world-building, interesting characters, some very unexpected events and a strong story, all undermined slightly by what I thought was a weak ending. But I went through it at a pace, drawn in by all the above positive attributes. Rarely do I find I want to know more about a character, but that applied to a few here. I had previously read the first Mistborn trilogy, which started out brilliantly and faded by the third book, so I did not have high expectations. But I am reconsidering Sanderson, and casting my eye over his considerable ouevre, looking for a likely next choice.