Future History from Alien Encounters.
Rudy Rucker is a mathematician and SF writer.  He met "Frank Shook" at a lecture;  Shook talked to him about aliens and "three-dimensional time".  Was he a madman, or had he really been serially abducted and shown the future?  Uncertain of his own motives, Rucker started a series of meetings with Shook which led to a complete future history, as related and shown to Shook by his alien abductors.
True, false, or a creation or Rudy Rucker's mind?  All are possibilities in this fascinating book which reads like a mixture of Whitley Streiber's 'Communion' and H G Wells's 'The Shape Of Things To Come'.