Betrayal

Summary
From the back cover: Ambassadors from all over the Federation have assembled on Deep Space Nine for a conference that will determine the future of the planet Bajor. Keeping dozens of ambassadors happy is hard enough, but when hidden terrorists start blowing up the station, Commander Benjamin Sisko must track a hidden enemy who strikes at will. Then things get even worse: A new Cardassian commander arrives, demanding the return of Deep Space Nine to the Cardassian Empire. With Deep Space Nine now a dangerous minefield, Sisko must defuse a situation that threatens the very existence of the planet Bajor.

Plot
Various species are visiting Deep Space Nine for a conference to negotiate for access to potential markets in the Gamma Quadrant accessable via the newly discovered Bajoran Wormhole. The conference, however, is being threatened by a wave of bombings, prequmably by a Bajoran faction, which are taking place on the station.

At the same time the Cardassian government, declared traitors for abandoning the wormhole, has been toppled by a coup, and a Galor class starship under the command of one Gul Marak has arrived on the station, demanding the reutrn of Terok Nor, the handover of which they claim was illegitimate as it was conducted by the "traitor's" government. A conflict over the issue is averted temporarily, but soon Marak is complaning that one of his crew has taken refuge on the station and is demanding his reutrn.

All the while the bombings continue, and an ultimatum by the apparent culprits is given to the station commanders, evacuate within 72 hours or be destroyed.