Juggler of Worlds by Larry Niven and Edward M. Lerner

200 Years Before the Discovery of the Ringworld

This is a sequel/parallel to Fleet of Worlds and to Neutron Star. The story touches on and slightly ties together many short stories, which starts to get slightly annoying.

The thesis is that civilizations have to use the insane to manage relations with other civilizations: relatively courageous Puppeteers (defined to be insane by the rest of the herd) and paranoid humans. And so we have the interwoven stories of Nessus the Puppeteer and Sigmund Ausfaller the human.

Since Ausfaller (in charge of anticipating and foiling nefarious maneuvers by various aliens) is seriously paranoid, it is hard to make him a sympathetic character, and the book relies heavily on Niven's trademark puzzles. For a change, a character shows some jealousy when his inamorata goes for someone else--Niven hasn't been very realistic at portraying human love lives in the past. This must be Lerner's influence.

The Puppeteers appear as less than super-intelligent, with emotion-driven politics and sometimes surprising carelessness.

I don't want to introduce spoilers, but since the action all happens before Ringworld you know in advance that there has to be some benign resolution to the plots and counterplots and growing threats. Let me just say that the denouement ties together so many threads and puzzles that I don't see much more room for new stories in Known Space, without introducing an entirely new cast of alien characters. The Ringworld series is tied up and early Known Space is now pretty much tied up: pre-Known Space might have a few stories in it, but probably not many puzzles.

I understand that other authors have written some Known Space works (some in the Man-Kzin War series, for example), but I have read none of them.

Not the best, but if you like Known Space you should read it.