Through Struggle, the Stars
by John Lumpkin
War is imminent between Earth's great space powers for reasons no one fully understands. When a young U.S. Space Force officer is assigned to shepherd an old spy out to the colonies, he begins to discover what lies at the root of the conflict. A hard science fiction novel by a former Pentagon and CIA reporter for the AP.
"Great, good fun." - Analog
"Very much recommended." - Midwest Book Review