The Ponson Case · Chapter
VII: Cosgrove's Trip North explained
Inspector Tanner investigates Cosgrove Ponson's alibi for the night of Sir William's murder.
What happens
Inspector Tanner investigates Cosgrove Ponson's alibi for the night of Sir William's murder. He verifies Cosgrove's story by checking with the butler, a tobacconist, and Miss Betty Belcher. Despite some suspicions about Miss Belcher's testimony, Tanner finds the alibi credible and considers the possibility that he has been on the wrong track.
Themes in this chapter
Deception and Identity
Tanner uses deception (posing as Mr. Willoughby) and suspects Miss Belcher of lying about Cosgrove's alibi.
Justice and Investigation
Tanner systematically verifies Cosgrove's alibi, interviewing witnesses and checking physical evidence like cigarette ends.
Characters to notice
- Inspector Tanner
Investigates Cosgrove's alibi, interviews the butler and Miss Belcher, and consults a tobacconist about cigarette ends.
- Cosgrove Ponson
Provides an alibi for the night of the murder, claiming he missed his train and visited Miss Belcher at the theatre.
- Betty Belcher
Corroborates Cosgrove's alibi, stating he visited her at the Follies Theatre on the evening in question.
- Austin Ponson
Mentioned as a suspect Tanner has been investigating, but the chapter focuses on Cosgrove's alibi.
- Sir William Ponson
The murder victim; his death is the central event under investigation.
Key passages
“She did not speak for some moments, and Tanner felt instinctively she had seen his little trap, and was considering a way out.”
Tanner sensed that Miss Belcher recognized his trick and was thinking of how to respond.
Illustrates Tanner's suspicion of Miss Belcher's honesty.
“Tanner found himself in the street with a baffled feeling of having handled the interview badly.”
Tanner left the interview feeling he had not managed it well.
Shows Tanner's self-doubt during the investigation.
“The motor never would have risked going up to Luce Manor, as it would have been heard—in fact, no motor did so.”
A car would have been too noisy to approach Luce Manor unnoticed, and none was heard that night.
Tanner's reasoning that Cosgrove could not have committed the murder by car.