Quark feels threatened when a charming con artist arrives on the station and opens up a competing bar and casino on the Promenade. Meanwhile, Chief O'Brien is determined to beat Doctor Bashir at racquetball.

Chief O'Brien and Dr. Bashir help the T'Lani and the Kelleruns eliminate their stockpiles of deadly biological weapons used in their centuries-long war. However, when both governments decide to make sure no technical knowledge of the weapons remains, O'Brien and Bashir must put their differences aside in the name of survival.