Let’s Kill Uncle

Let’s Kill Uncle

Year: 1966

Runtime: 92 mins

Language: English

HorrorThriller

A 12‑year‑old orphan who inherits a fortune is stranded on an island with his uncle, a British intelligence commander bent on killing him. The boy’s only ally is a courageous young girl. He wields hypnotism, a shark‑filled pool, fire and poisonous mushrooms as weapons. Now the island is a lethal arena where trust is scarce and every move could be the last, so.

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Let’s Kill Uncle (1966) – Full Plot Summary & Ending Explained

Read the complete plot breakdown of Let’s Kill Uncle (1966), including all key story events, major twists, and the ending explained in detail. Discover what really happened—and what it all means.

When Russell Harrison dies, his estate—valued at $5 million—passes to his only child, Barnaby Harrison. He will receive the fortune when he reaches adulthood, so for now Barnaby goes to live with his uncle on a remote, sparsely populated island. The uncle, Uncle Kevin Harrison, is a celebrated war hero, a former British commando whose autobiography, Killing the Enemy, recounts numerous accounts of extreme close combat. The setting and the isolation of the island cast a quiet backdrop for a family drama that blends memory, loyalty, and mortal risk.

On the boat to the island, Chrissie joins Barnaby; she is about his age and not shy about voicing skepticism. The two children spar from the start, with Chrissie insisting that Barnaby’s tales about his uncle’s exploits are exaggerated or false. Chrissie has come from a broken home and will be living with her Aunt Justine, who also resides on Uncle Kevin’s island. The unusual household arrangement frames a tense dynamic where imagination and truth collide, and where Barnaby’s need for a heroic narrative meets Chrissie’s demand for evidence.

Even after their arrival, Barnaby’s misbehavior persists. He peppers Chrissie with tall tales designed to impress or frighten her, a pattern that keeps the atmosphere charged with suspicion and curiosity. Yet Barnaby continues to idolize his heroic Uncle Kevin Harrison and devours the stories in his uncle’s book, seeking a sense of belonging and bravery in a world that often feels uncertain and unstable.

One night, the major, his wartime beret and battledress visible, wakes Barnaby and takes him on what he calls “an adventure.” He leads him to high cliffs that overlook the crashing surf, and, in a calculated moment, hypnotizes Barnaby, planting the chilling suggestion that he walk off the cliffs to his death. The moment is both dramatic and unsettling, a turning point that reveals the depths of the adults’ conflicts and the peril inherent in their intertwined schemes.

“an adventure.”

From below, Aunt Justine spots Barnaby perilously close to the edge and shouts, jolting him awake from the trance. A shaken Barnaby believes he was walking in his sleep, but Uncle Kevin later jovially explains that the intention was to kill Barnaby for his inheritance. Although the first attempt fails, the uncle makes clear that he will try again, underscoring the dangerous stakes that hover over the family’s fragile web of lies and loyalties.

As the story unfolds, Barnaby’s history of deception—combined with the uncle’s calculated danger and Chrissie’s growing awareness—leads others to doubt his claims of persecution. That skepticism persists until Chrissie uncovers the truth and proposes a stark counter-move: they might kill the uncle before he can claim Barnaby’s life for himself. What follows is a trio’s intricate sequence of assassination attempts, each designed to protect or destroy, depending on who holds the leverage at any given moment. The conflicts shift between manipulation, counter-maneuvers, and fragile alliances, producing a psychological battlefield rather than a physical one.

In the end, the confrontation resolves into a stalemate that leaves the participants with more questions than answers. The only lasting harm is psychological, not bodily, and the children—and perhaps the adults as well—are left to confront the unsettling question of which form of danger is worse: the threat of death, or the corrosive power of lies and fear. The island, with its quiet beauty and hidden fury, becomes a mirror for the characters’ inner battles, forcing them to reckon with how far they will go to secure what they believe they deserve.

Last Updated: October 09, 2025 at 12:39

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