A faint rumble came from overhead. The sound differed from thunder; it sounded huge.

Trying to ignore what was possibly the sound of his death, Cal searched desperately for his son-in-law as he stepped on to the tar road where the bridge reached the ground.

The search did not take long. As he swung his light, Cal saw Bob lying on the ground a short distance away. Hurrying to Bob’s side, Cal kneeled and checked for signs of life.

Bob was breathing. Cal slapped his face and drew Bob back to consciousness with a groan and blinking. There was no time to let the boy recover. Cal dragged Bob to his feet to walk toward the draw as Bob showed signs of comprehension.

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“What’s happening?” Bob croaked and worked his legs to keep up with Cal.

Without relinquishing his hold, Cal allowed Bob to walk. He forced them on to better speed. “We have to get out of the valley right now. It’s about to explode.”

“Where’s Cynthia?”

“She’s out already.” Cal hoped he was right, then Bob suddenly stopped and shifting the direction of their flight. “What the hell are you doing?” realized he was shouting because of the noise. The roar was getting louder fast.

“This way,” Bob shouted in reply.