The Fundamental Things Apply — Marilyn Tracy

THE MAN FROM YESTERDAY

Something strange, something terrifying, was happening at White Sands, and Dr. Valerie Daniels could find no scientific explanation for any of it. Science certainly could not explain away the man who came walking toward her that shining morning in the Nevada desert. He reached out to her across half a century--and touched her soul forever.

A terrible mistake fifty years in the past had left Major Perry Deveroux suspended somewhere between yesterday and tomorrow, while the world he knew had changed beyond recognition. Now he had no way home, and no place in this brave new world. His only hope, his only comfort, lay in a woman unlike any he had ever known--and in a love that could not be bound by time.