That one had me for a while, too. But it’s plot is different, even tho some of the details are similar.
Besides, I found it. INVADER by Albert Hill - The reviews match up for the plot we remember, plus, it has the name of the weapon, “graser.”
A search of used books by its ISBN turns up a lot of available sources.
ISBN: 0515054151
Interesting…
The title, timing (1980) and plot details make one wonder if the inspiration didn’t come from the video game, Space Invaders.
Man oh man. Thanks, NoClueBoy.
I’ve been trying to get that book for 2 years.
Woo Hoo!!
Also, my thanks to you who contributed to this thread.
I ordered the book from Amazon.
Yippee!