Strong Poison · Chapter
The Arsenic Test explained
Wimsey and Parker review the evidence against Norman Urquhart, including his financial motives and lies about Mrs.
What happens
Wimsey and Parker review the evidence against Norman Urquhart, including his financial motives and lies about Mrs. Wrayburn's will. Bunter performs a Marsh test on powder from Urquhart's envelope, confirming it contains arsenic. Despite this, Parker notes they still lack proof of opportunity for administration. Wimsey stays up late studying toxicology and trial records, eventually deducing how the murder was done.
Free preview opens on this chapter — companions, themes, and character notes appear beside the text.
Narrative arc
Story tension across the book — this chapter sits in Falling action.
- Setup
- Breaking point
- Aftermath
- Closing
This excerpt is the dramatic climax because it marks the emotional and psychological peak where the party’s re…
Full beat labels and climax notes unlock in the reader.
Follow the arc while readingThemes in this chapter
- Intellect and Detection
Wimsey and Parker methodically analyze evidence, and Wimsey's late-night study of toxicology and trials leads to a breakthrough.
- Deception and Appearance
Urquhart's lies about the will and his false draft document are central to the case against him.
- Poison and Arsenic as Metaphor
The Marsh test confirms arsenic in Urquhart's possession, linking the physical poison to the metaphorical corruption of his character.
Characters to notice
- Lord Peter Wimsey
Leads the discussion of evidence, oversees the arsenic test, and stays up all night studying to solve the murder method.
- Chief Inspector Parker
Summarizes the case against Urquhart, acknowledges the arsenic evidence, but insists on proving opportunity for a jury.
- Bunter
Performs the Marsh test for arsenic on the powder from Urquhart's envelope, and later realizes the solution to the murder method.
- Miss Murchison
Provides the envelope containing arsenic from Urquhart's office, and witnesses the test results.
- Freddy Arbuthnot
Present during the arsenic test, makes light-hearted comments about the proceedings.
- Mr. Norman Urquhart
Discussed as the prime suspect; evidence of his financial misdeeds and lies about the will is reviewed.
Key passages
“Are you convinced, Charles?”
Wimsey asks Parker if he is now persuaded of Urquhart's guilt.
Wimsey seeks Parker's professional agreement after presenting the evidence.
“I know now how it was done.”
Wimsey announces he has figured out the method of the murder.
After a night of study, Wimsey achieves a key insight into the crime.
“It proves that Urquhart has arsenic in his possession”
The test shows Urquhart had access to arsenic.
Parker acknowledges the significance of the forensic evidence.
