Fearing his father may be stranded in time—or worse—Shel enlists the aid of Dave Dryden, a linguist, to accompany him on the rescue mission. Their journey through history takes them from the enlightenment of Renaissance Italy through the American Wild West to the civil-rights upheavals of the 20th century. Along the way, they encounter a diverse cast of historical greats, sometimes in unexpected situations. Yet the elder Shelborne remains elusive. And then Shel violates his agreement with Dave not to visit the future. There he makes a devastating discovery that sends him fleeing back through the ages, and changes his life forever.

    But while attending a lecture given by Samuel Taylor Coleridge in 1810, he becomes marooned in Regency London, where dark and dangerous forces know about the gates in time.Caught up in the intrigue between rival bands of beggars, pursued by Egyptian sorcerers, and befriended by Coleridge, Doyle somehow survives and learns more about the mysterious Ashbless than he could ever have imagined possible...

    But soon the galactic stargate will close, isolating Tiamat, and the 150-year reign of the Summer primitives will begin. Their only chance at surviving the change is if Arienrhod, the ageless, corrupt Snow Queen, can destroy destiny with an act of genocide. Arienrhod is not without competition as Moon, a young Summer-tribe sibyl, and the nemesis of the Snow Queen, battles to break a conspiracy that spans space. Interstellar politics, a millennia-long secret conspiracy, and a civilization whose hidden machineries might still control the fate of worlds all form the background to this spectacular hard science fiction novel from Joan D. Vinge.