What's the Name of That Book??? discussion

This topic is about
Tatja Grimm's World
SOLVED: Adult Fiction
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SOLVED - old sci fi book uses peoples brains and or heads spinal columns as organic computers [s]
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The book is made up of 3 short stories or novellas spliced together. My memories are of the ending of the third part.
(view spoiler)[where the bad guys are running some kind of illegal business using preserved brains or heads and possibly spinal cords as organic computers. (hide spoiler)]
There might have been an agent of some sort trying to find or solve the problem on a low tech planet.