You sleep in the middle of the day. The twin towers of the World Trade Center in 20th Century Manhattan, once the world's tallest buildings, top out at 35 stories each. No one has ever heard of the Mason-Dixon line. Cigarettes seem never to have existed. So much is different in so many subtle ways that you feel your Paranormal Memory will be overwhelmed completely, yet you know that somehow, somewhere, it was all caused by a solitary change in the fabric of Time. Can you find thecommon element that determines whether billions of lives will be plunged into darkness and death?