As the war between the Federation and the Klingon Empire intensifies, Sisko leads an undercover team deep into Klingon territory in an attempt to expose the Changeling impersonating Chancellor Gowron.

When Grilka, Quark's ex-wife, unexpectedly visits DS9, Quark asks an already smitten Worf to help him pursue his former wife. Elsewhere, O'Brien and Kira struggle with their feelings for each other now that Kira is carrying the O'Brien's unborn child.