Ebook: Assemblers of Infinity

If you want to read some of Kevin J Anderson's books I would highly recommend starting with this one!! This book was nominated for a, very much deserved, Nebula award in 1994.
The basic story line involves a human moonbase crew discovering alien construction of some sort on the moon. They try to unravel the purpose of the construction while having to deal with a trigger happy military that is eager to destroy it before it can harm the Earth.
This is a very good read, quite the page turner!!