Following immediately on from the events of the 2007 Deep Space Nineomnibus Twist of Faith, These Haunted Seascontinues the post-TV-series Star Trek: Deep Space Ninesaga with two major novels first published in the Mission GammaDS9 mini-series. Twilight:With the Dominion War behind them, the crew of the USS Defiantjourneys through the wormhole as Commander Elias Vaughn blazes new trails into the unexplored reaches of the Gamma Quadrant. Elsewhere, political forces throughout the Alpha Quadrant gather to determine the future of Bajor. And as a father and daughter confront their past, a mother and son are battling for the future. This Gray Spirit: The war-weary Cardassians send a familiar ambassador to station Deep Space 9 on a mission of hope, opening up old wounds and conjuring old ghosts. As tensions on all sides rise, Colonel Kira Nerys discovers that the line dividing friend from foe is narrower than she ever imagined. Meanwhile, the crew of the damaged starship Defiantforges an uneasy alliance with a mysterious alien species, one whose unusual biological makeup is the key to power in that region of the galaxy.
As the crew becomes ensnared in a web of deceit, they must also struggle to stave off a genocidal war.