The League of Frightened Men

Brilliant, methodical detective who relies on logic and orchestrates the investigation from his residence. He uses careful questioning and social leverage to identify the true culprit, preferring to solve the case through intellect.

Wolfe's sharp-witted assistant who handles fieldwork and guards the suspects' movements. Loyal and practical, he provides quick observations and keeps the investigation moving through tense situations.

A crippled but calculating author who becomes the focal point of suspicion. His relationship with Hibbard's daughter adds a personal stake, while his quiet demeanor masks strategic calculations.

Harvard-associated professor whose past prank ties the group together. He organizes the reunion of old friends, driving the tension as old resentments surface.

Hibbard's daughter, her romance with Paul Chapin adds personal stakes and complicates loyalties during the investigation.

Chapin's elder brother, resentful and volatile. He despises Wolfe and Goodwin for alleged earlier accusations and ultimately drives the kidnapping, revealing the dangers of unchecked anger.

A banker and the mastermind behind the crimes; he manufactures debt rumors to exploit others and ultimately is revealed as the killer behind the letters.

Physician within the group who is shot during the confrontation; his presence marks the danger of the gathering and elevates the stakes for the investigators.

Taxi driver invited to Wolfe's gathering but declines to attend, highlighting the human element of risk and social dynamics within the circle.

The inspector who oversees the case, arresting Mark for kidnapping and ensuring the truth comes to light after Wolfe's deductions.