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'The criminals and us – we're all in the same business. The difference being, our clients pay us to keep one jump ahead of the criminal mind' – Ian Souter. SIS opens its doors for the first time.

Invited to discover why a research laboratory is losing money, even though they have a monopoly in the medical research trade, the Protectors discover that someone is making overtures to the competition and is prepared to sing — for a price.

Accepting what appears to be a routine assignment, SIS suddenly find themselves involved in violence when they're framed by a gang of ruthless racketeers.

Following up on a lead, Souter and Shoesmith find themselves in a deserted warehouse which should contain the answer to a riddle they're determined to solve. They find nothing of interest — beyond a dead body.

An injured railwayman, a loop-line rendezvous at midnight: clues which the Protectors must crack to discover the headquarters of a gang of hijackers — and deliver a young man from a life of crime.

Guarding a world-famous stamp collection locked in a bombproof vault hardly seems a dangerous assignment. But the Protectors will need all their guile when they come up against a brilliant criminal.

The SIS team find themselves up against a gang who intend to infiltrate a union to play a sordid game of industrial espionage which could destroy a union official and his family.

A young girl's bid for political asylum and a team of vigilant security men spell trouble for Souter and Shoesmith when they're assigned to investigate the validity of the girl's claims.

Conman Smokey Grey is anxious to unload £30,000 in stolen jewels. But the Protectors have other more important things to occupy their minds as Heather has been kidnapped.

How – and why – is a timid bank clerk connected to a baffling case of fraud? If they are to save an innocent man's life, the Protectors must find the answer — their dilemma: their chief suspect has disappeared.

When the past catches up with a highly-placed spy. Souter and Shoesmith find themselves facing a race against time to find the connecting link between the man and a recently-released political prisoner.

When personal disaster strikes terror into the heart of a prominent government minister, the Protectors, assigned to guard the man during a luxury cruise, find themselves in very dangerous waters.

Returning from their last assignment, the Protectors are asked to guard a valuable stature in transit from Corinth to Venice: a mission that once again that once again finds them all at sea and surrounded by sharks of the human variety.

When Heather falls victim of a wages snatch. Souter and thief are in strange company. Meanwhile, Shoesmith discovers a surprising motive for the robbery.