Millennium Book One: The Fall Of Terok Nor

At the climactic close of the TV series of Star Trek Deep Space Nine the forces of the Federation and their allies finally overcame the Dominion invaders and averted the threat of totalitarian rule.

And yet ... the future of the Alpha Quadrant is by no means as safe as it seems. Deep within the bowels of Deep Space Nine is a secret that has been kept for seven years. When it is uncovered the very heart of the Federation will be ripped apart, succeeding where the shapeshifting Founders failed. The destruction of the Federation is at stake. Only the crew of Deep Space Nine can stop it - but will they be in time?