Every man has his price. It is money for some - other things for others. For McGill, when an effort is made to brainwash him, it's suffering.

McGill is given the task of protecting a weakling crook,Rufus Blake, who is prepared to give evidence in court against his vicious brothers.

Who is - or was Mariocki? McGill waits in trepidation as the hours tick slowly to midnight when he will discover if persistant threats to kill him will be carried out.

A million dollars have been hidden away in a Lisbon bank. McGill is the only man with the key to the safe deposit, but he is not the only man after the money - there are certain governments interested too..

McGill has a tough journey to Lisbon in the company of a blackmailing crew. Even when he reaches the safe deposit - and the million dollars - his troubles are far from over..

A man returns from the dead. He has been dead, officially, for six years, but in the dark labyrinths of international espionage, who knows the truth? The man from the past is Harry Thyssen - the man responsible for McGill's being what he is today - discredited, fired from Intelligence and found guilty without a trial.

Respectability, like civilisation, is only a veneer. There is always the dog beneath the skin. But why should three respectable businessmen be planning a murder?

A beautiful painting can bring out the best in some, the worst in others. McGill encounters both types when he is asked to trace a missing masterpiece.

Police and private detectives fail to trace a village boy who has disappeared. McGill is called in to a kidnapping drama that involves two apparently unconnected people in an emotional crisis that changes the course of their lives.

Strange, terrifying events are shattering the calm of an English village in which McGill is making straightforward inquiries - inquiries which draw sullen resentment and suspician..

""The signora... find the signora"" The last words of a dying man present McGill with a puzzle - who is the signora?

McGill encounters intrigue and lies when he is engaged to discover the truth behind a young man's attempted suicides.

McGill is tricked into arranging a meeting between two old comrades of the Spanish Civil War. One betrayed the other. But are they on opposing sides?

Henry Faversham, the English adviser to a Central American Republic's President, is accused of stealing the country's gold reserve. McGill is assigned to watch, record and report on Faversham - without becoming involved.

What is the truth about Father Loyola, a Jesuit priest in Africa? Is he geniune - or is he a crook? McGill faces one of his most difficult and disturbing cases.

McGill is framed for murder after a small time private investigator has come to him for help. The only way to save himself is to find the killer.

McGill is put on the case when a noted oceanographer disappears with secret information...

McGill takes on a strange assignment in East Germany - and finds himself back in the world of espionage.

A blind girl is the innocent victim of circumstances when present at a murder she cannot see.

McGill takes on the unpleasant work of saboteur to infiltrate a company police force which has gained disapproval by its ruthless methods.

McGill has the task of trying to fit pieces of a human jigsaw together.

McGill tries to trace the origin of some compromising photographs - and a noted lawyer has to chose between his ideals and his reputation.

A recently released crook goes in search of past gang members and his share of the loot. Murder and mayhem soon follow...

Why does dying Chester Farson, a multi-millionaire, refuse to see his daughter? And who is putting up a valuable family possession for auction? The worried daughter contacts McGill.

Why should the people employing McGill deny all knowledge of him? Strange events occur when he finds himself involved in the drama of a political exile's campaign against the new rulers of his country.

Called to help an old friend, McGill investigates her story that she is being followed and her husband's claim that she's neurotic. Strange events make McGill wonder just who is playing a double game.

When a wealthy woman hires McGill to bring her playboy husband to heel, McGill finds himself accused of murder - and faces the threat of the guillotine.

A Senior Civil Servant's romantic entanglement with a vivacious adventuress brings McGill a delicate situation to resolve.

McGill organises a raid on a fortified mansion in the Pyrenees - ostensibly to steal paintings. But his colleagues are unaware of his real motive...