Mabel Manderson

Philip Trent

Trent falls in love with Mabel Manderson during the investigation, complicating his professional objectivity.

Nathaniel Burton Cupples

Mabel is Cupples's niece, and he acts as her guardian and confidant.

John Marlowe

Marlowe and Mabel share a secret romantic attachment, which becomes a central motive in the case.

Sigsbee Manderson

Mabel is Manderson's unhappy wife, trapped in a cold and oppressive marriage.

Nathaniel Burton Cupples

Mabel is Cupples's niece, and he acts as her guardian and confidant.

Philip Trent

Trent falls in love with Mabel Manderson during the investigation, complicating his professional objectivity.

Sigsbee Manderson

Mabel is Manderson's unhappy wife, trapped in a cold and oppressive marriage.

John Marlowe

Marlowe and Mabel share a secret romantic attachment, which becomes a central motive in the case.

Trent's Last Case

The widow of Sigsbee Manderson, interviewed by Trent.

III: Breakfast

Discussed as the niece of Cupples, described as proud and suffering from Manderson's unexplained coldness.

V: Poking About

Mentioned as sleeping in the inner room; Célestine expresses loyalty to her.

VI: Mr. Bunner on the Case

Briefly mentioned as having told Bunner about Trent's presence, and as the subject of gossip with her French maid.

VII: The Lady in Black

Seen sitting on a cliff ledge in black, lost in thought, making a gesture of freedom. Later, she meets Trent and answers his question about Manderson's request for money on the night of his death.

VIII: The Inquest

Testifies at the inquest, describing her husband's changed behavior and his final words about sending Marlowe to Southampton. Afterward, she asks Trent for his arm, feeling faint.

IX: A Hot Scent

Mentioned as having felt ill after leaving the witness box at the inquest, but is now recovered. Trent's investigation involves prints from her bedroom window.

X: The Wife of Dives

Mrs. Manderson is introspective and emotionally burdened, revealing her unhappiness in her marriage and her social struggles.

XI: Hitherto Unpublished

The wife who, from her bed, spoke to the impostor believing him to be her husband; her drowsy question is noted.

Evil Days

Mrs. Manderson is remembered by Trent with a mix of love and suspicion. She has left England for Italy and later returns to London, living quietly and avoiding society.

XIII: Eruption

Finally confronts Trent about his manuscript, thanks him for his chivalry, and reveals the true nature of her relationship with Marlowe.

XIV: Writing a Letter

Urges Trent to write the letter, reads it over his shoulder, and later asks him to tell her uncle about their engagement.

Double Cunning

Mentioned as having shown great goodness to Marlowe during a difficult time in his life.