The Long Night of Centauri Prime — Peter David

Bombed to the brink of oblivion, the planet Centauri Prime is starting the slow and painful process of rebuilding, under the watchful eye of Emperor Londo Mollari. But Londo is in turn being watched--and manipulated--by the conquest-hungry Drakh. The malevolent beings are reshaping the Centauri Republic into a secret seat of power from which to strike out at their enemies--especially the Interstellar Alliance.

All but helpless to resist, Londo watches as his beloved Homeworld is transformed into a ruthless police state. And the Drakh have willing allies, including one of Londo's own countrymen--Durla, a powerful official with his own sinister agenda.

As the abuses of the repressive new Republic escalate, the double-edged Drakh master plan begins to unfold. Their goal is to smash the Interstellar Alliance by assassinating its president, John Sheridan, and to obliterate Earth, using a fabled, monstrous Shadow weapon known as a Planet Killer . . .