Retief's War — Keith Laumer

THAT RESOURCEFUL RETIEF IS BACK!

Its Retief the galactic policeman and Earthman on a visit to the planet of Quopp, where Earthmen must tread quietly or not at all. But Ambassador Longspoon has a plan to unite all the hostile tribes of Quopp under one government-- to make them more friendly to Earth.

Yet already Retief has learned of another plan-- the evil, half-human, half-machine Groaci's plan to destroy the whole scheme-- and he must act with incredible speed and cunning if he is to avert impending planetary chaos!

FOLLOW THE FURTHER ADVENTURES OF RETIEF -- ALREADY AN UNDERGROUND HERO