C.S. Friedman's In Conquest Born was a formative science fiction novel for me. I read it in my early teens, and fell in love with it for its sweeping canvas of galactic civilizations locked in war, its meticulously realized cultures, and its strange, driven characters, who were all sympathetic no matter what side they were on.
Twenty years later, its sequel, The Wilding came out. According to the back cover copy, fans had been clamoring for a sequel for years. That was news to me - much as I loved In Conquest Born, it had never occurred to me that it wasn't complete and able to stand alone. So, I'd felt a little ambivalent about The Wilding, as indicated by the fact that I bought it the instant I saw it in a bookstore, and then waited over a year to read it.
I'm glad I finally did read it. It didn't blow me away the way In Conquest Born did, but that's hardly surprising. (I'm not sure that In Conquest Born would blow me away in the same way if I read it for the first time now. It's still a wonderful novel, but at the time it was an rare example of the kind of complex, culturally aware space opera that is rather more common now.) It still has the sweeping canvas of galactic war, meticulously realized cultures, and driven characters, although the whole book managed to feel a bit less epic than its predecessor.
I'm rather keen now to go back and read the two books back to back, just to fully appreciate them, and see all the connections.
Anyway, if you're thinking of reading this, read In Conquest Born first.