The Thurb Revolution by Alexei Panshin

ALIEN ART AND HUMAN ASPIRATIONS COMBINE IN
THE
THURB REVOLUTION
The little-known, backwater planet Pewamo seemed an unlikely site for bomb-throwers, pornographers and maniacs-yet ask Admiral Beagle, ever-watchful for the moral safety of his world, and he would tell you that such unsavory individuals were collecting in droves on Pewamo.
Normally Pewamo was the habitat of slumberous vacationers and odd pink clouds that floated idly overhead and didn't bother anybody - but then Anthony Villiers arrived, bringing his obdurately alien companion Torve the Trog, and Pewamo would never be the same again.
Strange sounds were heard regularly in the night. Villiers spoke in riddles when ques- tioned by Admiral Beagle. Torve the Trog rode his speedy red tricycle on obscure missions. And somehow an army gathered around them.
But not even Villiers knew that one of the men he'd attracted was an assassin, sent to kill him....

Condition: Acceptable. Some wear and minor damage.