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A very original SF idea (humans are the only sentient beings for billions of years who evolved to such a sentient stage, uplift, without the help of any of the other alien races, the galactics; furthermore, humans have uplifted chimps and dolphins, and maybe discovered intelligent life within a solar atmosphere - and those galactics are not happy about these upstart humans), with some great characters (alien, human, chimpanzee), and a fairly satisfying murder whodunit (human or one of the galactic races). Yet there was something about the prose, the detail, or the pace of the story that wasn't page turning.