In Annex 10 in the Adirondack Mountains in New York, the scientists under the leadership of astronomer Dr. Gray can hardly believe the things their instruments are telling them; but, because their equipment is absolutely reliable, they HAVE to believe, and on that ill-fated June 30th, they begin to see the chaos will affect mankind. The Earth is growing steadily hotter. Temperatures rocket as the sun shines through the night and the world is plunged into endless day. Everywhere people are suffering--rich and poor, criminal and family man--and none know if or when relief will ever come. Is this the end of the world as we know it?