Here’s a first look at the probable cover of Hilldiggers. I like this. Someone has definitely read the book to produce it because this is the ‘massively secure space station’ mentioned in the blurb below. A station called Corisanthe Main.
During a war between two planets in the same solar system – each occupied by adapted humans – what is thought to be a cosmic superstring is discovered. After being cut, this object collapsed into four cylindrical pieces, each about the size of a tube train. Each is densely packed with either alien technology or some kind of life. They are placed in three Ozark cylinders of a massively secure space station. A female scientist, conducting research there, falls pregnant, gives birth to quads, then commits suicide.
By the end of the war one planet has been devastated by the hilldiggers – giant space dreadnoughts employing weapons capable of creating mountain ranges. The quads have grown up and are assuming positions of power in the post war society. One of them will eventually control the hilldiggers.