Suite Mentale by Randall Garrett

An old man sat quietly in his lawnchair, puffing contentedly on an expensive briar pipe and making corrections with a fountain pen on a thick sheaf of typewritten manuscript. Around him stretched an expanse of green lawn, dotted here and there with squat cycads that looked like overgrown pineapples; in the distance, screening the big house from the road, stood a row of stately palms, their fronds stirring lightly in the faint, warm California breeze.

The old man raised his head as a car pulled into the curving driveway. The warm hum of the turboelectric engine stopped, and a man climbed out of the vehicle. He walked with easy strides across the grass to where the elderly gentleman sat. He was lithe, of indeterminate age, but with a look of great determination. There was something in his face that made the old man vaguely uneasy -- not with fear but with a sense of deep respect.