Robert Silverberg 
Masks Of Time 

Vornan-19 fell from the sky and landed, naked, on the Spanish Steps in Rome on the afternoon of Christmas Day toward the end of the millennium. And that, for Leo Garfield began an extraordinary and eventful year. For Garfield is an acknowledged expert in the time-reversal of sub-atomic particles and Vornan-19 claims to come from far in the future, a claim that has to be investigated. But the world is in a strange, edgy state as it prepares to move into the next millennium and is ready and willing to see the charming and magnetically charismatic Vornan as some kind of messiah. Even Garfield and his fellow scientists come under Vornan’s spell. But can he really be from the future? Or is he just a charlatan and a fraud?First published in 1968