Professor Goodman

Hugh Drummond

Hugh Drummond relentlessly pursues Professor Goodman, who is a key figure in the criminal conspiracy, making them direct adversaries.

Mr. William Robinson

Mr. William Robinson works closely with Professor Goodman, likely as a subordinate or partner in the criminal enterprise.

Sir Raymond Blantyre

Professor Goodman and Sir Raymond Blantyre have a professional connection, likely within the same criminal or business network.

Mr. Edward Blackton

Mr. Edward Blackton and Professor Goodman work together in the criminal enterprise, sharing goals and methods.

Carl Peterson

Carl Peterson and Professor Goodman are partners in crime, coordinating their efforts against Drummond.

Mr. Lewisham

Mr. Lewisham and Professor Goodman are colleagues in the criminal operation, working toward common objectives.

Algy Longworth

Algy Longworth, as Drummond's friend, is opposed to Professor Goodman and his criminal activities.

Mr. William Robinson

Mr. William Robinson works closely with Professor Goodman, likely as a subordinate or partner in the criminal enterprise.

Hugh Drummond

Hugh Drummond relentlessly pursues Professor Goodman, who is a key figure in the criminal conspiracy, making them direct adversaries.

Sir Raymond Blantyre

Professor Goodman and Sir Raymond Blantyre have a professional connection, likely within the same criminal or business network.

Mr. Edward Blackton

Mr. Edward Blackton and Professor Goodman work together in the criminal enterprise, sharing goals and methods.

Sir Raymond Blantyre

Professor Goodman and Sir Raymond Blantyre have a professional connection, likely within the same criminal or business network.

In Which the Metropolitan Diamond Syndicate Holds Converse with Mr. Edward Blackton

The scientist whose discovery of synthetic diamonds threatens the diamond industry. He is described as oblivious to financial concerns, focused solely on the scientific value of his work.

II: In Which Professor Goodman Realises That There Are More Things in Life Than Chemistry

Shows Drummond the threatening letter and is followed by a man; he is determined to announce his discovery despite the risks.

III: In Which Strange Things Happen in Professor Goodman’s Laboratory

The target of the Syndicate's plot, unaware of the danger he is in.

IV: In Which Mr. William Robinson Arrives at His Country Seat

Reported dead in the explosion at his house, with his boot being the only identifiable item found.

In Which Mr. William Robinson Loses His Self-Control

Forced to write letter to Drummond; reveals he gave notes to Drummond; frightened and confused.

VII: In Which Drummond Takes a Telephone Call and Regrets It

His death is the subject of the investigation; Drummond reveals he lunched with him and that he received a threatening letter.

In Which Drummond Plays a Little Game of Trains

Mentioned as having been forced to carry out an experiment for Robinson, with his resistance broken.

IX: In Which Professor Goodman Has a Trying Time

Learns the truth about his abduction and the deception, reluctantly agrees to share his process under duress.

X: In Which Drummond Goes on Board the S.Y. Gadfly

Realizes he has been fooled by Robinson and, following Drummond's warning, attempts to delay their departure by requesting special salts for making colored diamonds.

In Which Drummond Leaves the S.Y. Gadfly

Rescued from the water, nearly drowned but alive.

XII: In Which He Samples Mr. Blackton’s Napoleon Brandy

Mentioned as having been restored to his family in London, angry and wanting Blantyre's blood. His notes on the process are destroyed by Drummond.

In Which Drummond Receives an Addition to His Library

Brings the news of Sir Raymond Blantyre's suicide, visibly agitated.