The World of Ptavvs concerns the re-awakening from stasis of an ancient alien who has the power of mind control, so when a human psychic tries to use a mind-to-mind contact machine to communicate it all goes a bit wrong. The alien escapes from stasis and goes on a chase across the solar system looking for something he left in his other stasis suit. That something, if he finds it, would spell enslavement for the population of earth.
Early Niven like this is big on ideas, big on science, full of plot and not so great with characters or the "human" side of the story. I think you either forgive the later because of the former or it bugs you. Fortunately I'm in the first camp and able to enjoy it.