Erin Patterson's seemingly innocent lunch took a sinister turn in rural Victoria, Australia, leading to the poisoning of her in-laws and their sister, and nearly claiming the life of their pastor. The case unfolded in Leongatha Hospital, where Dr. Chris Webster treated the patients initially thought to be suffering from food poisoning.

Upon emergency admission, the symptoms displayed by Heather and Ian Wilkinson – intense gastrointestinal distress – initially puzzled the medical team. Heather described the comforting flavors of Erin's homemade beef Wellington, which led Dr. Webster to suspect that the meat might be the culprit. However, a call from the Dandenong Hospital regarding the true cause of the patients' condition quickly shifted the gravity of the situation.

After confirming toxic mushroom ingestion, Dr. Webster noticed Erin entering the hospital. Her response to being questioned about the source of the fungi, simply citing "Woolworths," raised his suspicions further. Coupled with her detached demeanor, Dr. Webster felt he had stumbled onto a darker reality; Erin, he suspected, was the orchestrator of this tragedy.

Although he attended to his duties, the emotional weight of her possible guilt lingered, especially after watching the Wilkinsons, exhausted and ill, being whisked away to a facility equipped for severe cases. Following erratic behavior from Erin, who later left against medical advice, Dr. Webster alerted law enforcement to prevent further potential harm.

As the trial progressed, Erin maintained her innocence, dubbing the incident a tragic accident. Nonetheless, Dr. Webster would later learn of her conviction for multiple murders, allowing him to feel a sense of relief and justice fulfilled. The emotional reunion with Ian Wilkinson, now recovered, provided a sense of closure as Dr. Webster reflected on the life-or-death stakes of his day that began with a casual dinner invitation.