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13 Episodes 1964 - 1964
Episode 1
Mourning the death of his fellow agent and friend Nick Craig, Miller, and new GS5 operator Peter Clarke, are sent to check out explosion at sea. Their investigations bring surprising - and to Miller - highly satisfactory results.
Episode 2
Working undercover, GS5 agent Sally Lomax discovers that an elusive typewriter holds the key to her investigations into 'accidents' on a film set. Suspecting sabotage, she uncovers a murder cartel.
Episode 3
Masquerading as a news reporter, Tony Miller investigates the death of a policeman suspected of being 'on the take' from gamblers. His search for the cop killer leads him into the world of high finance.
Episode 4
Assigned to investigate a series of sabotage incidents involving a new machine being designed for South America. Clarke 'defects' to the Fascist party responsible for the crime - with dangerous results.
Episode 5
GS5 operative Tony Miller finds himself facing a tough problem: how could a man be seen driving a car though a village and yet, when the vehicle crashed, the man is found to have been dead for several hours?
Episode 6
When a protection racket gang declare war on innocent people, GS5 agent Tony Miller is assigned to infiltrate the gang and force the opposing sides into a showdown. He achieves this - with startling results.
Episode 7
Stock's disbelief that a 'master criminal' is behind a series of brilliantly executed robberies is severely shaken when operative Peter Clarke brings him conclusive proof that successful criminal Dr Ayre is masterminding further audacious crimes.
Episode 8
The island of Baleric hides a sinister secret which GS5 operator Tony Miller must solve if he is to have any chance of locating the whereabouts of a fellow undercover agent believed kidnapped by director Zafre.
Episode 9
Sent to check out the strange goings on at a secret missile base. GS5 operatives Clarke and Miller find their cover blown and the enemy awaiting their arrival - a dangerous situation when you're seeking a sadistic killer.
Episode 10
Masquerading as a dope-peddler, agent Tony Miller meets a beautiful Chinese girl and finds himself involved with a secret patriot army, who intend to use his services - whether he likes it or not.
Episode 11
Stock assigns his entire department to locate Franz Rodolph Gruber, a former Nazi chief in Hungary. Gruber is known to have in his possession the Howarth jewel collection - which Stock suspects will be used to finance a new Nazi regime.
Episode 12
Undercover operative Sally Lomax is assigned to delve into the past of a man whom Stock believes to be a murder. The man, Dawson, is new managing a holiday camp - at which several 'accidents' have taken place. Sally books in - but her holiday is far from peaceful.
Episode 13
After a whirlwind courtship on the French Riviera, GS5 agent, Peter Clarke, posing as a shy businessman, 'marries' Yoette, an attractive French girl - in order to discover the secret behind another French girl's mysterious death.