When a Cardassian freighter, the Bok'Nor, explodes at DS9, the Cardassians blame Federation colonists in the newly established Demilitarized Zone. Meanwhile, Quark is approached by a Vulcan with an unusual business proposition.

When an addictive implant in Garak's brain begins to break down, causing the exiled Cardassian extreme pain, Dr. Bashir must convince a reluctant Garak to accept his help.