Rogue Berserker by Fred Saberhagan
Alas, this is the end. It's the last Berserker story Fred Saberhagan published.
Too bad, although still showing some minor issues, this one is better than the proceeding 4 novels.
In many way's this is the equivalent to some of the best storylines in the novels at the beginning of the series. Things that "have to happen" turn out to be red herrings. It's also very hard to be sure who's on which side as things progress.
And, just to ruin my life forever, there's an obvious lead-in to at least one more novel, but I don't know if he even outlined it or not.
If only Fred Saberhagan had lived longer.