Surrender to the Will of the Night is the third book in The Instrumentalities of the Night series by Glen Cook.
Plot:
The world is changing. Instrumentalities of old are awakening. Winter is on its way, and everyone knows to fear it. Praman are fighting Praman, the Wells of Power are weakening, and allies plot against one another at every turn. In the midst of all this, Piper Hecht – or Else Tage – is trying to keep himself and his family alive. He’s known to the Night as the Godslayer, and their attentions are turned upon him whenever they are near.
He’s trying to keep his army employed, even if he has to take the offer of the Grail Empire to become the leader of an army readying itself for a crusade. A crusade that would strike his homeland, and may reveal who he truly is.
But while Piper is juggling politics, family, base urges and his own men, his sister Heris is taking on an task of an even more humongous size. Kharoulke the Windwalker, the dark god from ancient times, is awake. And he’s coming.