The film opens with two unnamed ministry officials dismissing a beekeeping oddity as a lunatic conspiracy, even as a series of letters from a beekeeper claim he has developed a killer bee strain and promises to act if he isn’t taken seriously. On the island, a different kind of drama unfolds around Vicki Robbins ([Suzanna Leigh]). The pop singer collapses from exhaustion while performing on television and is sent to recuperate in a quiet cottage on Seagull Island. The nearby “rest home” is run by a gloomy, quarrelsome couple, Ralph Hargrove ([Guy Doleman]) and Mary Hargrove ([Catherine Finn]), with Ralph also tending bees as a hobby. His neighbor, H. W. Manfred ([Frank Finlay]), is a more enigmatic beekeeper who claims to be able to control his bees using a tape recording of a high note produced by a death’s-head moth, a device he says hypnotizes the insects. The contrast between the seemingly ordinary seaside setting and the eerie claims about bees sets the mood for a thriller that blends natural fear with human treachery.
As Vicki settles into her temporary refuge, she begins to notice unsettling events around the cottage: Mary’s dog is attacked by the bees, and soon Mary herself is killed in a bee attack. The danger appears to point toward the Hargroves, and Vicki’s instincts push her to investigate. She and the elusive Manfred start to dig into the other farm’s secrets. Manfred pushes her to search through Ralph Hargrove’s papers, where she uncovers a startling discovery: Hargrove has managed to isolate what is described as “the smell of fear” and turn it into a liquid form. Manfred explains that this fear pheromone could be used to lure and bait the bees, suggesting that Hargrove has been actively manipulating the swarm for some unknown purpose. This revelation raises the stakes and makes Vicki question whom she can trust.
The tension escalates when a swarm of bees breaches the cottage and attacks Vicki in her room. She escapes to Manfred’s house, where he coldly reveals his own plan: he intends to return to Hargrove’s farm to gather evidence, but his visit was really a ruse to set a trap and unmask a killer—revealing that he himself is the one behind the lethal scheme. With Vicki now aware of his true nature, Manfred tries to eliminate her as a witness. She fights back, destroying his moth recording, and in the confrontation he is stung to death. The force of the attack hurls him through a banister and, in a grim coincidence, ignites a fire that rapidly engulfs the house. The chaos of the blaze draws the attention of the bees as well, and they turn their attention on those who remain on the scene.
Meanwhile, the chaos outside intensifies: Manfred’s bees swarm and attack the pub landlord as investigators corner the Hargrove residence. Ralph Hargrove intervenes, using a smoker to clear the insects and urging a rapid action—he even warns his ally to discard Manfred’s jacket, which is implicated in carrying the scent of fear. The two men rush to the burning house on Manfred’s property and arrive just in time to rescue a trapped Vicki from the flames. The violent confrontation on the island roils to a close as the fire dies down and the danger seems to recede, leaving behind a trail of scorched truth.
The next morning, Vicki prepares to leave Seagull Island. A bowler-hatted ministry official arrives to start formal investigations into the deaths, signaling that the strange events may finally begin to be understood in official terms. The island’s mystery lingers, but the immediate threat to Vicki has ended, and she steps back into the world with explanations to offer and a wary awareness of how fear, even in the form of a seemingly harmless creature like a bee, can be weaponized.
