Motive vs. Psychology in Crime

Where it surfaces

• Vance Accepts a Challenge

  Vance contends that motive is irrelevant because everyone has motives; instead, individual psychology determines who acts on them.

• A Motive and a Threat

  The chapter explores Leacock's threat as a motive, but Vance's skepticism about Pfyfe's testimony suggests a deeper psychological complexity beyond surface motives.

• The Grey Cadillac

  Vance probes the psychological profiles of suspects like Leacock and Pfyfe, exploring their temperaments and potential motives, rather than relying solely on physical evidence.

• Links in the Chain

  Vance argues that despite the logical evidence against Leacock, the psychological profile does not fit, highlighting the tension between motive and character.

• Admissions and Suppressions

  Vance contrasts conventional legal thinking with psychological insight, emphasizing the importance of understanding motives and personal relationships over mere evidence.

• XVII: The Forged Check

  Vance's psychological approach to extracting the truth from Mrs. Banning contrasts with conventional interrogation methods, emphasizing motive and psychology.

• XVIII: A Confession

  Vance challenges the surface motive of Leacock's confession, probing deeper psychological reasons such as chivalric self-sacrifice.

• XIX: Vance Cross-Examines

  Vance argues that Leacock's psychological profile makes him capable of the crime but incapable of committing it in the manner it occurred, highlighting the distinction between motive and method.

• XXI: Sartorial Revelations

  Vance uses psychological deduction about Benson's behavior and the murderer's knowledge of the household to infer motive and identity.

• XXIII: Checking an Alibi

  Vance argues the jewels were a mere addendum and that a deeper, vital motive drove the Major to murder, emphasizing psychological insight over surface evidence.

• The Arrest

  Vance emphasizes the Major's cold, calculating gambler psychology as key to understanding the crime, rather than mere motive.

• XXV: Vance Explains His Methods

  Vance emphasizes that the method of the crime (bold, direct, premeditated) was a direct expression of the Major's psychology, not merely his motive.