A Is for Acid (2002) Timeline Explained – Every Event in Order

Haigh began murdering for financial gain after developing a fatalistic worldview rooted in his strict Plymouth Brethren upbringing, where he believed himself to be one of 'God's elect' set apart from ordinary morality. His transformation from petty fraudster to killer was catalyzed by a prison reading of 'corpus delicti', which he completely misinterpreted as proof that murder couldn't be proven without a body. This misconception gave him false confidence that he could commit the perfect crime and escape detection.

Foreshadowing: His childhood belief in being specially chosen by God planted the psychological seeds for his later sense of invincibility.

• john haigh motivation
• murder for money
• plymouth brethren

While serving a prison sentence for fraud, Haigh encountered the legal term 'corpus delicti' and wrongly interpreted it to mean that murder couldn't be proven without a physical body. This misunderstanding convinced him he could commit the perfect murder by dissolving his victims in acid, erasing all evidence. He first tested this theory by dissolving mice in sulphuric acid, confirming his deadly theory before applying it to humans.

Foreshadowing: The timeline notes that his prison encounter with this legal concept directly fueled his 'dream of a perfect murder'.

• corpus delicti
• acid murder
• perfect crime

Haigh murdered the elderly McSwan parents to access their savings and maintain his cover. After killing their son Donald during WWII, Haigh had been pretending Donald was still alive and on the run. As VE Day approached and the pretense became harder to maintain, Haigh told William and Amy that Donald had returned and was waiting at his workshop. He then drove them there, murdered both, and dissolved their bodies in acid, inheriting their wealth and eliminating witnesses who might eventually discover the truth.

Foreshadowing: The timeline shows Haigh killed Donald first, then used the fabricated story of Donald's 'return' as the mechanism to lure his parents to their deaths.

• mcswan murders
• ve day
• elderly victims

Haigh was caught because a Home Office pathologist examining his workshop recovered undissolved gallstones and a pelvic bone from the acid residue, physical evidence that proved murders had occurred despite the absence of bodies. Additionally, Arnold Burton had grown suspicious of Haigh's involvement with the Hendersons' disappearance and reported his concerns to police, triggering the investigation that eventually led to Haigh's workshop and the crucial forensic findings.

Foreshadowing: Olive Durand-Deacon's disappearance prompted her friend Constance Lane to pressure Haigh into going to the police, creating the initial police scrutiny that led to the workshop search.

• gallstones
• forensic evidence
• pathologist

Haigh asked Gillian Rogers, his former flame from his engineering job, to visit his parents after his hanging because she was the only person from his past who still had a moral compass and connections to his family. This request represented one final act of manipulation, even at the end, Haigh was using someone to carry out a task that served his needs. It also provided closure to the only relationship in his adult life that hadn't been transactional or exploitative.

Foreshadowing: Gillian had previously broken off their relationship when she learned of his criminal activities, making her the one person Haigh perhaps respected enough to trust with this final errand.

• gillan rogers
• final request
• execution

Arnold Burton grew suspicious when he noticed discrepancies in the Hendersons' financial affairs and discovered that Haigh had forged signatures on documents related to their estate. When the Hendersons vanished and Haigh claimed they had relocated, Burton's doubts intensified. His suspicion was the catalyst that brought police attention to Haigh, marking the transition from private murders to public investigation.

Foreshadowing: The timeline shows Burton reported his concerns to police directly, which sparked the official investigation.

• arnold burton
• hendersons
• suspicion

Haigh chose acid disposal because he believed it was the key to committing the perfect murder, eradicating the corpus delicti (the body) so that murder couldn't be legally proven. His flawed understanding of the legal principle made him confident that without a body, he could never be convicted. The method also allowed him to quickly eliminate evidence and continue his scheme across multiple victims.

Foreshadowing: His early experiments with dissolving mice in sulphuric acid confirmed his theory before he applied it to human victims.

• sulphuric acid
• body disposal
• evidence destruction

Haigh confessed to killing Olive Durand-Deacon and claimed responsibility for five additional murders (with three more possible) when confronted by detectives. His confession was likely driven by a combination of factors: the overwhelming physical evidence, a desire for notoriety, or perhaps a twisted satisfaction in being recognized for his crimes. The confessions expanded the case beyond the single murder charge and revealed the true scope of his killing spree.

Foreshadowing: The timeline notes his confession came as police closed in, and he claimed six total killings with 'three more possible.'

• confession
• serial killings
• notoriety

Haigh avoided detection for years by carefully manipulating his victims' social circles and creating plausible cover stories for their disappearances. He positioned himself as a trustworthy friend and businessman, especially during wartime when normal social structures were disrupted. He maintained the fiction that Donald McSwan was 'on the run,' convinced the Hendersons' relatives they had relocated, and used his newfound wealth from each murder to sustain his credible lifestyle at the Onslow Court Hotel, making him seem legitimate rather than suspicious.

Foreshadowing: The timeline shows his method: befriending isolated or elderly people, gaining their trust, then eliminating them for financial gain while fabricating explanations for their absence.

• undetected
• wartime
• manipulation

Haigh murdered Olive Durand-Deacon, a fellow resident of the Onslow Court Hotel, primarily because his funds were running low and he needed more money. Olive's status as a hotel resident with likely savings made her a target. When she disappeared, her friend Constance Lane grew concerned and pressured Haigh to accompany her to the police to report Olive missing, forcing Haigh to quickly dispose of Olive's body in acid to cover his tracks before an official investigation could begin.

Foreshadowing: The timeline explicitly links Olive's murder to Haigh's 'dwindling funds,' showing financial desperation as the trigger.

• olive durand-deacon
• onslow court
• financial motive