"The logical heir to Isaac Asimov and Arthur C. Clarke" (Stephen King) takes readers on a science fiction adventure tour through time.When physicist Michael Shelborne mysteriously vanishes, his son Shel discovers that he had constructed a time travel device. Fearing his father may be stranded in time—or worse—Shel enlists the aid of Dave MacElroy, 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.