Two German policemen find a major heroin smuggling ring. When the ring leader is arrested, his wife takes over the business.

Opium farmer Fazal (Jamal Shah) is forced to Karachi after his poppy fields are destroyed; Jack's (Bill Paterson) report to the Commons becomes a personal concern.

Fazal's family is not convinced that life in Karachi is better than life on the frontier; Jack tries to head off a threatened customs strike.

Fazal supervises conversion of the opium crop to heroin; Karl's trial begins; the customs dispute worsens.

Jack returns to Pakistan and demands the arrests of drug dealers before he agrees to sign an aid agreement; Helen tries to make a deal with Tariq.

Jack returns to Britain and is fired; Ulli thinks that he has trapped Helen and intercepted a heroin shipment.