One of the women went back to the van and drove it into the turnaround. The others walked up, talking among themselves as the guard closed the gate and locked it again.

Sweat was pouring down my face; it felt like grease. My heart was triphammering.

They were out of my field of vision in the rear-view mirror. I took a chance and looked around.

I saw the back doors of the van swing open.

One of them carried a neat stack of sheets; another had towels; another had a pair of vacuum cleaners.

They trooped up to the door and the guard let them inside.

I drove away, shaking so badly I could hardly steer the car.

They were opening the house. He was coming.

Dolan did not trade in his Cadillac every year, or even every two – the gray Sedan DeVille he was driving as that June neared its end was three years old. I knew its dimensions exactly. I had written the GM company for them, pretending to be a research writer. They had sent me an operator’s manual and spec sheet for that year’s model. They even returned the stamped, selfaddressed envelope I had enclosed. Big companies apparently maintain their courtesy even when they’re running in the red.

I had then taken three figures – the Cadillac’s width at its widest point, height at its tallest, and length at its longest – to a friend of mine who teaches mathematics at Las Vegas High School. I have told you, I think, that I had prepared for this, and not all my preparation was physical. Most assuredly not.

I presented my problem as a purely hypothetical one. I was trying to write a science fiction story, I said, and I wanted to have my figures exactly right. I even made up a few plausible plot fragments – my own inventiveness rather I astonished me.

My friend wanted to know how fast this alien scout vehicle of mine would be going. It was a question I had not expected, and I asked him if it mattered.