Imperial Earth by Arthur C. Clarke (Paperback)

Colonists from the entire solar system converge on the mother planet for the 2276 celebrations.

Among the influx of humanity is Duncan Makenzie, scientist-administrator from the underground colony of Titan, one of the outer moons of Saturn. Makenzie is not just on Earth for the celebrations, though; he has a delicate mission to perform - for his world, his family and himself . . .