The Masks of Time — Robert Silverberg

A Nebula-nominated classic by a Grandmaster of Science Fiction, Robert Silverberg, The Masks of Time tells the story of Vornan-19...a naked man who suddenly appears on the Spanish Stairs. *** Vornon-19 claims to have come from the far future and has access to technological marvels that support his claim. But is he really what he claims to be? *** Leo Garfield and his fellow scientists must unravel the truth about Vornon-19, but are they up to the job, or will they too fall under his magic-like spell, just like the rest of the world who is ready to worship a new kind of a messiah?