Dean Koontz - Dark of the Woods

The first bit of trouble came even as they were leaving the starship on Demos's port field; it was a harbinger of worse times ahead.

Stauffer Davis walked down the corrugated ramp with his protection robot, Proteus, at his side. After a tedious flight out from the Alliance central worlds, he was so on edge that the gurgling of plasti-plasma with the robot's spherical, force-capped body ground hard on his nerves and made him somewhat nauseous. Proteus was ignorant of his master's irritation, for every ounce of his being, every drop of his quasi-liquid circuitry was concentrated on maintaining an optimum efficiency watch to detect even the slightest minim of hostile life before it could do damage to his human charge. As he floated on his grav plates, his tiny sensor nodes gleamed in the bright sun—some of them alive with color that radiated from within: amber, crimson, and a soft, pulsing blue.