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
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
Use these spoiler-safe prompts to notice the setting, the investigation and the details that may matter.
- Place
How does Midsomer University shape what people say openly, delay, or leave unsaid?
- Theme
Which details seem to carry more than one meaning, and what might be a red herring?
- Teamwork
Compare how DCI Tom Barnaby and DS Ben Jones gather information: who watches the room, and who presses the conversation forward?
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
Check the credits, then follow the source trail for production and filming details. Counts below describe this archive’s records.
The fictional setting and the real filming sites are separate pieces of information. The location desk currently connects it to 0 broader filming areas and 4 exact on-screen site identities.
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 ↗The chronology is the reference for the credits shown here. A programme homepage does not independently verify a filming date or every production detail. Where multiple transmission dates are listed, territory attribution needs checking. Story, teleplay and adaptation distinctions require the original credit wording; links to external synopses may reveal plot details.
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
Actor profiles for the detective, investigating partner and pathologist credited to this episode.
John Nettles
Tom Barnaby · Detective Chief InspectorAn English actor, author and narrator who was already a household name as Jersey detective Jim Bergerac. After Bergerac he spent five seasons with the Royal Shakespeare Company and later returned to television drama in Poldark.
- Bergerac
- Poldark
- Royal Shakespeare Company
Jason Hughes
Ben Jones · Police Constable · Detective Sergeant · InspectorA Welsh actor who first became widely known as Warren Jones in the BBC drama This Life. His later television work includes Marcella and The Pact, alongside substantial theatre work at venues including the Donmar Warehouse and Royal Court.
- This Life
- Marcella
- The Pact
Barry Jackson
Dr George Bullard · Police pathologistAn English stage and screen character actor whose career lasted more than five decades. His credits ranged from the landmark television play Cathy Come Home to Doctor Who, Barry Lyndon and many familiar British television dramas.
- Cathy Come Home
- Doctor Who
- Barry Lyndon
Portraits are used only where a reusable licence or public-domain release has been verified. Publicity stills and stock photographs are not copied into this independent guide.
Forensic desk
Dr George Bullard
- Credit
- Resident pathologist
- Played by
- Barry Jackson
Causton's long-serving pathologist is professionally unflappable, quietly witty and an old friend of Tom Barnaby.
Meet the Casebook pathologists →Spoiler-controlled deaths desk
Deaths recorded in this case
2 people die in this case, according to the linked death record.
Break the seal: reveal the death ledger
- 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
Verified killer
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
What was filmed where?
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 support the listed site uses; they do not establish every filming location in an episode.
Wider filming areas
Places connected to this file
No real-place link is published here until it can be tied to a specific, sourced screen use.