Case file · Series 25, Episode 4 · Season 25, Episode 4
Top of the Class
A head teacher is killed during an online PTA meeting, making an argument about a cancelled fundraiser the opening piece of evidence.
Verified filming locations
Every filming site currently documented in this Casebook file is listed here. The published evidence does not establish a complete production itinerary.
- Stoke Court · Stoke Poges, Buckinghamshire
The manor-house exterior and grounds become Causton Grammar School.
Site guide → Filming source ↗
Map lookup by place name. A private house’s exact address is not marked.
Selected episode credits
Top of the Class cast
These selected cast entries link to their published profiles. They do not include every name shown in the end credits.
Fiona Dolman
Isabel Shaw
Mel Giedroyc
Denis Lawson
Georgie Glen
Kenny Doughty
Lucy Gaskell
Dean Fagan
Lorna Watson
Milo Twomey
Jake Kenny-Byrne
Lewis Griffin
James Vaughan
Sophie Roberts
Sophia Razvi
The 60-second case card
Should I watch this one?
The apparent transparency of an online meeting only emphasises how much the school community has kept off camera.
- Best for
- Grammar school · PTA · Family history
- Mood
- Dark
- Team
- DCI John Barnaby with DS Jamie Winter
- Spoiler guidance
- Read the premise freely; open the marked sections only after watching. Check the linked provider advisory for further viewing information.
Why it matters
The apparent transparency of an online meeting only emphasises how much the school community has kept off camera.
Causton Grammar head teacher Estelle Hallis is murdered while colleagues and parents are connected to a PTA meeting. A heated dispute over a cancelled fundraising appearance creates an obvious line of inquiry, but the unusual weapon and carefully framed timing suggest a more deliberate performance.
The discovery that Estelle's daughter died before her mother changes the order in which Barnaby and Winter must reconstruct events. A third killing inside a local shop connects school politics to an older personal history and to somebody determined to punish several members of the same circle.
Break the seal: reveal the finding
Who was the killer in Top of the Class? (spoiler)
The apparently separate deaths form a planned sequence of revenge whose motive lies in a past account of responsibility rather than the immediate PTA dispute.
More episode detailsProduction, cast, deaths and filming information
Credits, context and checked facts
Production and cast
- TV series
- Series 25
- Episode number
- Episode 4
- Written by
- Helen Jenkins
- Directed by
- Matt Carter
- Listed transmission date(s)
- 29 December 2025
- Reported filming period
- June–July 2025
- Detective
- DCI John Barnaby
- Partner
- DS Jamie Winter
- Pathologist
- Dr Fleur Perkins · Annette Badland
- Principal setting
- Causton
- Casebook tone
- Dark
Sources accompany the production credits and filming links.
Fictional settings and real filming places are listed separately. Filming links include 0 mapped areas; 1 exact site.
Credits and archive connections
- Writer credits6 episodes credited to Helen Jenkins
- Director credits8 episodes directed by Matt Carter
- Release positionCase 144 of 144
- Story characterDark · Grammar school · PTA
- Location evidence1 exact screen-use match
Fleur's examination establishes that Kara Hallis died before the murder witnessed during the PTA call, reversing the order in which the crimes become known.
The investigation moves between the grammar school, a PTA fundraiser dispute and a village shop as the shared past becomes visible.
Sources for the production file
Published episode chronology and credits ↗Official ITV programme page ↗Filming-location reference index ↗Credits follow the linked chronology. Dates can differ between territories. Consult original credits for story, teleplay and adaptation wording. External synopses may contain spoilers.
The performers behind this case
Core cast
Follow the cast links for full actor and character guides.
Neil Dudgeon
John Barnaby · Detective Chief Inspector- Messiah
- Life of Riley
- The Mrs Bradley Mysteries
Nick Hendrix
Jamie Winter · Detective Sergeant- Black Mirror
- Marcella
- The Crown
Annette Badland
Dr Fleur Perkins · Police pathologist- Ted Lasso
- Doctor Who
- EastEnders
Image credits identify the licence used. No programme publicity stills are reproduced.
Forensic team
Dr Fleur Perkins
- Credit
- Resident pathologist
- Played by
- Annette Badland
Spoiler-controlled deaths
Deaths recorded in this case
3 people die in this case, according to the linked death record.
Break the seal: reveal the list of deaths
- Estelle Hallis
Murder · Stabbing or impalement
Performer check- Estelle Hallis: Mel Giedroyc
- Kara Hallis
Murder · Other recorded death
Performer check- Kara Hallis: Sophia Razvi
- Dominic Mayhew
Murder · Stabbing or impalement
Performer check- Dominic Mayhew: Jake Kenny-Byrne
Break a second seal: reveal the verified killer
Who was the killer in Top of the Class? (spoiler)
Tim CrawfordTim pushed abusive headmaster Vincent Bell from a cliff at the outdoor centre years earlier, then killed Kara Hallis, Estelle Hallis and Dominic Mayhew when the recovered globe and their deductions threatened to expose him. His planned attack on Holly Randell was interrupted.
Verified motive
Tim killed former headmaster Vincent Bell in anger over years of sadistic abuse, believing only he could make Bell face consequences. Nineteen years later he killed Kara after she connected him to Bell and intended to go to police, killed Estelle after misreading Kara's message as evidence that she knew, and killed Dominic when he recognised the globe's link; Holly was the interrupted next target.
Real place → fictional identity
Where was Top of the Class filmed?
Stoke Court
Used as: The manor-house exterior and grounds become Causton Grammar School.
Sources accompany the identified filming places.
Wider filming areas
Places connected to this file
No real filming place is confirmed for this case.