This book is about the theory that another planet called Planet X or Nemesis revolves around the sun in an elliptical orbit. It passes by Earth every 3600 or so years. During this close passing, catastrophic things happen to the Earth. This planet is due to pass by in the near future. Mr. Hazlewood's science is a bit questionable. This book is an interesting read for anyone who is interested in the Planet X/Nemesis controversy.