In the year 2276, Duncan Makenzie travels from Saturn's moon, Titan, to Earth as a diplomatic envoy to the United States. As a member of Titan's 'First Family' descended from the moon's original settlers 500 years before, Duncan finds himself welcomed into the glittering political and social scene in Washington.

But Duncan isn't just on Earth for a diplomatic visit. Haunted by the memory of a woman from Earth he once loved, Duncan is also driven by the need to continue the family line — despite a devastating genetic defect.