Peter investigates a kidnapping and murder.
Drummond and Dexter plot to get rid of a new supervisor.
Peter investigates two Russian scientists.
Sarah enters a bar where Peter is working under cover.
Drummond and Maxwell vie for a role in a promotional video.
A Chinese double takes Peter's place.
Peter must seduce a sultry German agent.
Soviets mistake Sarah's typewriter for a stolen decoder.
Terrorists crash an embassy reception.
An interdepartmental competition turns serious.
Drummond asks Peter to find out if Maxwell is a mole.
Assumed dead for 12 years, a spy brings shocking news.
Peter must halt publication of a book at his wife's firm.
The agents try to discredit an ambitious MP.
Peter searches for an elusive black box.
Peter muddles a raid by animal-rights activists.
A mistake sets a hit man on Piglet's trail.
Peter tries to prove a couple are East German spies.
Peter houses a defecting Soviet agent.
Spies recruit an unwitting electronics lecturer (Nicholas Lyndhurst).