Chapter 13: The Quarry Knife and Matilda Gregory’s Alibi

⚠️ Spoiler Warning: This guide contains detailed spoilers for the entire novel. Proceed only if you've finished reading or are comfortable knowing the plot.

Summary

Venn leaves DC Ross May behind to pursue routine forensic work—soil samples from Sammy Barton’s property and next‑of‑kin enquiries—then follows local officer Jimmy Rainston up Quarry Bank with Jen. At the rusted fence marking the old quarry they meet crime scene manager Brian Branscombe, who reports that a kitchen knife matching Sal Pengelly’s description has been found inside the quarry, not thrown from outside. Venn puzzles over why the killer would make a detour to hide the weapon there rather than drop it into the sea. He decides that the action feels staged, “childish.”

Venn and Jen then visit the school’s autumn fayre, where they spot Alan Ford pushing his grandson Artie in a wheelchair. After the headteacher Matilda Gregory opens the fayre, Venn questions her. She confirms she was babysitting for Peter and Ruth Smale at the old rectory in Willington the night of the murder, returning after 11 p.m. and staying overnight. Jen presses her about a witness report of a woman of her description near Rosco’s terrace in the early hours. Matilda denies it, insists she does not lie, and suggests the witness was mistaken or that another woman looked like her. She says she and her husband invited Rosco to dinner but he declined because he was expecting a visitor. When the interview ends, Venn and Jen leave; as they pass the school gate, Matthew sees Matilda watching them through a window with her phone to her ear.

Key Events

• Venn delegates Ross to collect soil samples from Barton’s yard and garden and to check for soil at the murder scene.
• The murder weapon—a wide‑bladed kitchen knife—is found lying on the ground inside the quarry, not concealed.
• Branscombe confirms the knife shows no rust and was left there intentionally; Venn speculates the killer staged the scene childishly.
• Venn and Jen attend the school’s autumn fayre, where Matilda Gregory is the headteacher.
• Jen interviews Matilda about her whereabouts; Matilda provides a babysitting alibi for the Smale family.
• Matilda is confronted about the witness sighting near Rosco’s house and firmly denies it.
• Matilda mentions that Rosco turned down a dinner invitation because he was expecting a visitor.

Character Development

• Matthew Venn: His inner monologue reveals guilt about his own motives for leaving Ross behind, and he reflects on his strict childhood compared to Jonathan’s rebellious youth. A memory of his father playfully swinging him into the air surfaces, a rare moment of warmth he treasures.
• Jen Rafferty: She takes the lead in the interview with Matilda, demonstrating careful, probing questions. Venn silently approves of her technique.
• Ross May: Though absent, his eagerness to join the excitement is noted; Venn keeps him focused on mundane but crucial forensic tasks.
• Matilda Gregory: Initially flustered by the timing, she becomes defensive when accused of lying. Her religious conviction (“I don’t lie… it’s a sin”) and her modest yet stylish appearance are highlighted. She offers a clear, checkable alibi but refuses to elaborate further.
• Alan Ford: A brief, tender moment as he lifts Mary’s daughter into the air, contrasting with the grim murder investigation and foreshadowing his role as a caring grandfather.

Themes, Symbols, or Motifs

• Staging and childlike behaviour: Venn sees the killer’s actions as “childish” games. The knife left in the quarry, easily found, feels deliberate, as if the killer is toying with the police—mirroring the earlier suggestion that the body was posed.
• Trust and deception: Matilda’s insistence that she “doesn’t lie” sets up a conflict between her stated integrity and the witness report. The theme of hidden truths runs through the chapter.
• Community versus investigation: The fayre is a tight‑knit village event; the detectives’ presence causes wary curiosity. The killer seems to be playing with the community as much as the police.
• Fatherhood and memory: Venn’s memory of his father’s rare playfulness provides a poignant contrast to his austere upbringing in the Brethren, deepening his character.

Why This Chapter Matters

This chapter shifts the focus from the body to the weapon, introducing a concrete piece of forensic evidence whose placement raises more questions than answers. The interview with Matilda Gregory tightens the net around the mysterious woman seen near Rosco’s house while simultaneously offering her a verifiable alibi. Venn’s personal reflections humanise him and set up a recurring tension between his detective instincts and his emotional baggage. The confirmation that Rosco was expecting a visitor deepens the mystery and hints at a connection to the killer.

Study Questions

1. Why does Venn consider the killer’s decision to hide the knife inside the quarry rather than drop it into the sea “childish”? What does this tell us about the killer’s psychology?
   Answer: Venn thinks the killer could simply have thrown the knife into the sea from the tender and it would never be found. Instead, they made a deliberate detour to a place where the weapon would certainly be discovered. This suggests the killer is playing games with the investigation, possibly taunting the police or trying to control the narrative. It implies a level of arrogance or theatricality.

2. How does Jen’s interview technique with Matilda Gregory differ from Matthew’s usual approach, and why does Venn approve?
   Answer: Jen takes the lead, asking pointed yet conversational questions. She gently pushes Matilda on the witness sighting without being aggressive. Venn notes that she is “making a splendid job of the interview,” admiring her directness without hostility. Her style contrasts with Venn’s more introspective nature, and he values her ability to extract information while keeping the witness calm.

3. What significance does Matilda’s claim that she “doesn’t lie” hold in a story about a murder investigation?
   Answer: Her statement is both a character claim and a potential red flag. If she truly never lies, then the witness must be mistaken—or another woman was present. But in a genre built on deception, such a claim can also signal a character who is adept at lying or rationalising. It sets up a test: if her alibi holds, the killer is someone else; if it doesn’t, her integrity is shattered.