Sir Clinton Driffield

Inspector Flamborough

Inspector Flamborough frequently collaborates with Sir Clinton Driffield on investigations, relying on his insights and authority.

Dr. Trevor Markfield

Markfield and Driffield share a mutual respect and friendly rapport, often discussing the case as equals.

Silverdale

Silverdale and Driffield are often at odds, with Silverdale possibly being a suspect or antagonist in the investigation.

Dr. Ringwood

Dr. Ringwood provides medical or scientific consultation to Driffield, maintaining a formal colleague relationship.

Avice Deepcar

Avice Deepcar and Sir Clinton Driffield share a romantic tension or past attachment, hinted by their frequent and personal interactions.

The Chief Constable

Driffield coordinates with the Chief Constable as a senior figure in the investigation, sharing information and strategy.

Yvonne Silverdale

Sir Clinton Driffield and Yvonne Silverdale are acquaintances, possibly through social circles or the investigation.

Whalley

Whalley may be a subordinate or assistant to Driffield, assisting with investigative tasks.

Hassendean

Hassendean and Driffield are adversaries, possibly with Hassendean being a suspect or opposing figure in the case.

Justice

Justice is likely a legal figure (e.g., magistrate or judge) who works with Driffield on the case.

Mr. Renard

Mr. Renard is an antagonist or competitor to Driffield, possibly involved in the crime or a conflicting interest.

Inspector Flamborough

Inspector Flamborough frequently collaborates with Sir Clinton Driffield on investigations, relying on his insights and authority.

I: The Dying Man

The Chief Constable, whom Ringwood recalls and plans to contact about the murder.

II: The House Next Door

The Chief Constable who receives Dr. Ringwood's phone call about the murder and agrees to come to Ivy Lodge.

III: Sir Clinton at Ivy Lodge

Arrives at Ivy Lodge with Inspector Flamborough, takes charge of the investigation, and interviews the Hassendeans.

IV: The Crime at Heatherfield

Leads the investigation, forces entry into Heatherfield, examines the murder scene and Mrs. Silverdale's belongings.

V: The Bungalow Tragedy

Receives the telegram from 'Justice' and leads the investigation to the bungalow, discovering the body.

VI: The Nine Possible Solutions

Leads the analysis of the nine possible solutions, reviews evidence, and decides to accompany Flamborough to interview Dr. Silverdale.

VII: The Fly in the Amber

Accompanies Inspector Flamborough to the Croft-Thornton Institute, leads the investigation, and later discusses inferences with Flamborough.

VIII: The Hassendean Journal

Reviews Hassendean's journal with Flamborough, discusses Silverdale's alibi and the mixed melting-point test.

X: Information Received

Leads the investigation, identifies the poison as hyoscine before Markfield confirms it, and interviews Miss Hailsham.

XI: The Code Advertisement

Receives and analyzes the coded advertisement from Mr. Justice; engages in logical deduction with Flamborough to narrow down possible solutions.

XII: The Silverdale Wills

Listens to Renard's story and discusses motives for murder with Flamborough, cautioning against being swayed by the latest evidence.

XIII: The Murder of the Informer

Receives news of Whalley's murder, analyzes the tourniquet, and discusses theories with Flamborough.

XIV: The Jacket

Present during the interrogation at the Croft-Thornton Institute; his expression indicates a rising opinion of Markfield.

XV: Sir Clinton’s Double

Chief Constable who remains calm about Silverdale's arrest and deduces the impostor's identity.

XVI: Written Evidence

Leads the analysis of the photographic evidence, notices subtle anomalies in the handwriting, and devises a plan to contact Dr. Markfield.

Mr. Justice

Leads the confrontation with Markfield, revealing detailed knowledge of the crimes and Markfield's relationship with Yvonne Silverdale.

XVIII: The Connecting Thread

Interrogates Markfield and reveals the evidence that led to his capture, including the signet ring and forged address.

Excerpts from Sir Clinton’s Notebook

Author of the notebook; analyzes evidence and develops hypotheses about the murders.