Mavis Nugent, Ellen McIntosh, a young widow in Greenwich, London, just before Christmas, drops her children outside the cinema so she can work at a local haberdashers. A man in the cinema queue approaches and hands out handfuls of what the children briefly believe are sweets, a small gesture that will have much larger consequences. By the end of the film, the cinema staff discover that several children have fallen unconscious, their bodies weakened by barbiturate poisoning. The incident triggers a police response, and an investigation is launched under the watchful eye of Inspector Duffy, Bernard Archard. The case quickly deepens as the clues accumulate.
As one child collapses in the street, a friend of the youngster points the investigators toward a troubling lead: two kinds of capsules appear to be involved. The hospital scene follows closely as Dr. Green, Desmond Llewelyn, and the nursing team strive to stabilize the patients, fighting against time and the uncertain threat to every child in their care. The medical staff’s efforts are steady but urgent, underscoring the human cost of the mystery and the pressure on those who must act quickly to prevent tragedy.
Meanwhile, the moral and legal puzzle tightens. The authorities uncover a more personal thread when his mother realizes that her adult son may not have all of the mental health medication that morning’s dispensing would normally supply. This realization pivots the investigation toward a nervous and vulnerable hospital outpatient, Simon Lacey, Roland Curram. Simon’s role in the broader conspiracy becomes a focal point, as investigators seek to understand how he may have unwittingly distributed the dangerous pills. The drama hinges on whether he genuinely knew what he was handing out, or if he was merely a reluctant participant in a larger, more insidious scheme.
The police act swiftly to apprehend Simon, but not before he has disposed of the rest of the drugs in a playground where children are at play, a moment that amplifies the urgency and moral stakes of the pursuit. The story then follows the race to locate Mrs. Nugent and her three children, weaving together the threads of fear, duty, and the fragile lines between caregiver, culprit, and innocent bystander. Throughout these events, the film maintains a careful, restrained tone that centers on the human consequences of deceit and danger, rather than sensationalizing the crime. The tension builds as the investigation continues, the hospital fights to save the vulnerable, and the city readies itself for the possibility of further harm, all while the roots of the mystery slowly start to unfold.
