Another Man’s Poison

Janet Frobisher leads a solitary life in an isolated home in Northern England, estranged from her husband who has a criminal past. Dr Henderson, a nosy local vet, is her closest neighbor and occasional confidant. She begins an affair with Larry, Chris's fiancé and a man many years her junior, which sets the stage for a dangerous love triangle.

The estranged husband unexpectedly turns up at Janet's secluded house, bringing old threats back into the present. Janet weighs her options as the risk of exposure grows with his sudden appearance. The encounter intensifies the tension around her carefully laid plans.

To remove the immediate danger, Janet poisons her husband using medication provided by Dr Henderson for her horse. She executes the plan with cold efficiency, masking the murder as if it were a tragic accident. The body is concealed for now as she prepares to move it.

As Janet is about to dispose of the body in the local lake, one of the deceased man's criminal cohorts arrives unexpectedly. The unwelcome visitor disrupts her plan and threatens to unravel the scheme she has crafted. Janet keeps her composure while the clock ticks toward a more dangerous revelation.

When Janet's secretary and Larry arrive at the secluded house, a mysterious man who helped her earlier arrives as well and pretends to be George, the long-absent husband. The impersonation introduces an unsettling layer of deception and uncertainty. Janet must decide how far she will go to protect the lie.

George and Janet trade accusations and insults, their fragile alliance cracking under pressure. The imposter's presence forces Janet to confront the consequences of her actions. The confrontation makes clear how precarious her deception has become.

Chris discovers Larry's affair with Janet and decides to leave for London. The revelation destabilizes the relationships Janet depended on and narrows her options. The possibility of losing her lovers heightens the danger of her deception.

Janet tries to persuade Larry to stay with her, but his heart lies with Chris, and he chases after her with little success. Her plea reveals the desperation driving her manipulation. The chase underscores the emotional stakes threading through the scheme.

To further destabilize Janet, George shoots her horse, an act designed to unsettle her and prove his volatility. The cruelty of the gesture deepens Janet's sense of isolation and the stakes of the plot. The event also complicates her plan's visibility.

Janet feigns remorse about Larry and Chris and sends George after Chris in an unsafe vehicle. The reckless pursuit ends in a crash, but Chris survives, leaving Janet with another unresolved threat. The moment reveals how her attempts to control outcomes only increase the danger.

The next morning, authorities are dragging the lake where the crash occurred. The operation confirms that Janet's scheme has entangled George and herself. The looming exposure lifts the curtain on the web of lies.

Janet's manipulation culminates as she tricks George into poisoning himself, sealing his fate. Dr Henderson arrives and reveals that he knew all along George was an impostor, noting that the real George had stopped by his house in the fog the night he arrived. The twist heightens the sense that every action has led to an inescapable conclusion.

Janet pretends to faint while Henderson processes the revelation, and he offers her a drink from the same flask she used to trick George. When she recognizes the flask, she realizes she has killed herself. The final moment erupts into hysterical laughter at the irony of her downfall.