Solid Poul Anderson space opera that combines political intrigue with romance, as was his specialty. It's dark, of course, but not nihilistic. Great head fakes—the primary antagonist, barely seen in the actual events—is a telepath (and the eponymous knight, perhaps) so we know he's controlling things behind the scene, but not how much. There are so many ways for a story like this to go wrong, but it mostly works, because Anderson doesn't go for the cheap twist.
The word usage is noteworthy, I thought: Besides making up words for sci-fi purposes, he also derives a lot of words from slavic, since the main human population is derived from Serbia. He's not above just plain making up a word (e.g., "scrittle") and certainly not above using a word in its archaic sense. This works descriptively but sometimes can be a challenge when trying to figure out which of the four situations you're in.
Anyway, very typical Anderson story, so if you like him, you'll probably like this, or if you don't know his style, this is a pretty breezy short book to get to know him.