1988’s Four Hundred Billion Stars was Paul J. McAuley’s debut novel. It was followed by 1989’s Of the Fall (US title: Secret Harmonies), a prequel set some centuries earlier than Four Hundred Billion Stars. In 1991 McAuley published Eternal Light, a direct sequel to this novel.
The invention of the phase graffle re-opened contact between the Earth and its abandoned colonies. A few decades later, the Federation for Co-Prosperity of Worlds stumbled across an alien civilization living on and among the asteroids orbiting the red dwarf BD+20o 2465. The aliens are unrelentingly hostile; they are known as the enemy. Ever since contact was made, the Federation and the enemy have been locked in war.
Astronomer Dorthy Yoshida has no interest in matters military, but her telepathic gift makes her an intelligence asset too precious to the Navy to squander on pure research. The asocial scientist is drafted into the war effort.