Larry Niven's Ringworld saga/extended thought experiment comes to a conclusion.
In the foreword, the author reveals that he never really intended for Ringworld to be more than a one-off story and interesting thought experiment. However, it captured the imagination, and so he returned for 3 more novels, adding the concept of Pak Protectors, another thought-experiment-turned-saga from his Known Space universe for novels 2 through 4.
We're at the final chapter, and there is now a burgeoning "fringe" war among the species of Known Space (mostly Humans and Kzinti) while the protector Tunesmith, Louis and their companions try to keep the Ringworld safe from invaders. The story is a pretty good windup to the saga...although it is now getting somewhat long in the tooth, and it is good that this is the last one.
However, I find the narrator pretty irritating. He makes Tunesmith sound like an overly cheery salesman (rather than a ghoul-turned-wizard) and Acolyte sound like a mentally subnormal child rather than an (adolescent) 7-foot tall feline predator. Especially a come-down after listening to the excellent narration of the previous book in the cycle, The Ringworld Throne.
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