With the conflict between the Klingons and Cardassians taking its toll, a shipment of desperately-needed replicators destined for Cardassia is set to pass through Deep Space Nine. Odo and Lt. Commander Eddington of Starfleet Security recommend heightened measures to deter both the Klingons and the terrorist group known as the Maquis, then reveal some troubling news — they believe there is a Maquis smuggler aboard the station, and they have some evidence that the smuggler is Kasidy Yates, Sisko's romantic interest. After hearing the basis for their suspicions, Sisko must order them to investigate the woman he cares for. Meanwhile, Garak and Ziyal get to know each other.

Penny Johnson (Kasidy Yates)
Kenneth Marshall (Lt. Cmdr. Michael Eddington)
Andrew Robinson (Garak)
Tracy Middendorf (Tora Ziyal)
Steven Vincent Leigh (Lt. Reese)
John Prosky (Brathaw)

• Kasidy Yates is arrested and sent to prison.
  
• Lt. Cmdr. Eddington was secretly working with the Maquis. In this episode, he leaves Starfleet.