In a departure from Kay's normal European venues, Under Heaven takes place in an alternate version of Tang Dynasty China. In a non-departure, Kay uses this scenery to paint pictures of deeply human characters buffeted by "interesting times" and succeeds in building an original, unique and moving story.
As always, Kay's strength is in the humanity underlying all the history that informs the story. The events of Under Heaven result in the deaths of tens of millions of people, but instead of focusing on the war and the famine, Kay focuses on individuals and how they navigate a world that seems to be crumbling around them.
It is moving, of course, and exciting, and filled with characters that olive and breathe and jump into the mind full-blown.
Kay is a master of this kind of story, thin on battle, and heavy on spirit, and this is certainly a wonderful example.