Case file · Series 12, Episode 4 · Season 12, Episode 4
The Glitch
A professor warns that his valuable computer breakthrough contains a dangerous flaw, placing research ethics against commercial pressure.
The 60-second case card
Should I watch this one?
A rare technology-centred case that translates software risk into familiar Midsomer rivalries over credit, money and control.
- Best for
- Technology · University · Cycling
- Mood
- Classic
- Team
- DCI Tom Barnaby with DS Ben Jones
- 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
A rare technology-centred case that translates software risk into familiar Midsomer rivalries over credit, money and control.
Professor George Jeffers has developed a powerful use for computer wafers but believes a glitch could endanger millions if the invention is deployed. Software executive Clinton Finn stands to lose heavily if Jeffers makes the flaw public.
Car attacks, break-ins and deaths draw Barnaby, Jones and Stephens through the university and Soft Earth Systems. Jeffers' passion for cycling becomes more than character detail when the detectives must understand routes, timings and a pursuit carried out on two wheels.
Break the seal: reveal the finding
Who was the killer in The Glitch? (spoiler)
Commercial pressure is real, but the murders also protect a more personal appropriation of Jeffers' work. Cycling evidence breaks the carefully engineered account of opportunity.
Spoiler-safe viewing companion
Three questions to carry into the episode
Three spoiler-safe questions for your rewatch.
- Place
What does Midsomer University conceal?
- Theme
Which details could have more than one meaning?
- Teamwork
Watch DCI Tom Barnaby and DS Ben Jones: who notices what?
More episode detailsProduction, cast, deaths and filming information
Credits, context and checked facts
Production and cast
- TV series
- Series 12
- Episode number
- Episode 4
- Written by
- Michael Russell
- Directed by
- Richard Holthouse
- Listed transmission date(s)
- 21 July 2009 23 September 2009
- Reported filming period
- October–November 2008
- Detective
- DCI Tom Barnaby
- Partner
- DS Ben Jones
- Pathologist
- Dr George Bullard · Barry Jackson
- Principal setting
- Midsomer University
- Casebook tone
- Classic
Sources accompany the production credits and filming links.
Fictional settings and real filming places are listed separately. Filming links include 0 mapped areas; 4 exact sites.
Credits and archive connections
- Writer credits5 episodes credited to Michael Russell
- Director credits16 episodes directed by Richard Holthouse
- Release positionCase 70 of 144
- Story characterClassic · Technology · University
- Location evidence4 exact screen-use matches
Stoke Court at Stoke Poges represents the technology company's headquarters.
Wellington College and the ruins of Waverley Abbey combine to create the academic setting.
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.
Selected episode credits
The Glitch cast
These selected cast entries link to their published profiles. They do not include every name shown in the end credits.
Jane Wymark
Laura Howard
Kirsty Dillon
Philip Jackson
Lucy Brown
Simon Chandler
Jim Norton
Jonathan Cecil
Nigel Whitmey
David Haig
James Musgrave
Hermione Gulliford
Shaughan Seymour
Josie Taylor
Joanna Roth
The performers behind this case
Core cast
Follow the cast links for full actor and character guides.
John Nettles
Tom Barnaby · Detective Chief Inspector- Bergerac
- Poldark
- Royal Shakespeare Company
Jason Hughes
Ben Jones · Police Constable · Detective Sergeant · Inspector- This Life
- Marcella
- The Pact
Barry Jackson
Dr George Bullard · Police pathologist- Cathy Come Home
- Doctor Who
- Barry Lyndon
Image credits identify the licence used. No programme publicity stills are reproduced.
Forensic team
Dr George Bullard
- Credit
- Resident pathologist
- Played by
- Barry Jackson
Spoiler-controlled deaths
Deaths recorded in this case
2 people die in this case, according to the linked death record.
Break the seal: reveal the list of deaths
- Emily Harte
Murder · Vehicle or machinery
Performer check- Emily Harte: Josie Taylor
- Daniel Snape
Murder · Vehicle or machinery
Performer check- Daniel Snape: Philip Jackson
Break a second seal: reveal the verified killer
Who was the killer in The Glitch? (spoiler)
Edward CanningEdward killed Emily Harte by mistake while using a car to target Dr George Jeffers, then killed Daniel Snape after Daniel remembered the vehicle. Edward's later bicycle attack on Jeffers was interrupted; Clinton Finn's separate break-in and assault on Jeffers are not recast as either murder.
Verified motive
Edward was trying to protect his son Jonathan's prospects of becoming Master and believed Jeffers's campaign would ruin both that future and the college. Emily was the unintended victim of his first attempt on Jeffers; he killed Daniel after Daniel remembered the car and might expose him, then again targeted Jeffers.
Verified important clue
Archive case 70 · checked 16 September 2026The old rally photograph of Edward Canning's Ford EscortThe archived image links Edward and Jonathan to the distinctive Escort whose number-plate digits Daniel remembered, converting the witness's fragment into the car used to kill Emily and explaining why Daniel was silenced.
Verified decisive clue
Archive case 70 · checked 17 September 2026The old rally photograph of Edward Canning's Ford EscortThe archived image links Edward and Jonathan to the distinctive Escort whose registration fragment Daniel remembered. It converts the witness's clue into the car that killed Emily, exposes why Edward silenced Daniel and preserves Emily as a mistaken victim, Jeffers as a surviving target and Clinton's assault as separate.
Verified death and discovery order
Archive case 70 · checked 16 September 2026- discoveryJeffers's campaign threatens Jonathan's succession
Edward believes George Jeffers will ruin both the college and his son's chance to become Master.
- deathEmily Harte is killed by mistake
Edward follows the departing cyclist and attacks with the old Escort, believing the rider is Jeffers rather than Emily.
- discoveryDaniel remembers the rally car
Daniel Snape recalls the Escort's colour and registration, connecting the fatal hit to Edward's old vehicle.
- deathDaniel Snape is killed
Edward kills Daniel before the witness can confirm the remembered car to Jeffers or the police.
- discoveryThe rally photograph identifies Edward
An archived image links Edward and Jonathan to the Escort and resolves the clue Daniel left behind.
- discoveryThe bicycle attack on Jeffers is interrupted
Edward uses the Escort to target Jeffers again but is stopped; Clinton Finn's separate break-in and assault remain outside the murders.
Real place → fictional identity
Where was The Glitch filmed?
Wellington College
Used as: The college represents St Frideswide.
Waverley Abbey
Used as: The ruined abbey contributes the remains of St Frideswide.
The Royal Standard of England
Used as: The pub becomes the local in fictional Aspern Tallow.
Stoke Court
Used as: The manor represents Soft Earth Systems headquarters.
Sources accompany the identified filming places.
Wider filming areas
Places connected to this file
No real filming place is confirmed for this case.