An ineffectual science teacher Will Hay is hired to a school that, after the wartime evacuation, has left its Mid‑England home at St Michael’s and been relocated to the remote Dunbain Castle on the Isle of Skye, Scotland. He adopts a cover as an old Etonian and gradually settles into the castle’s cloistered world, where he begins to get to know the peculiar local atmosphere and the traditions that cling to the place. In particular, he forms a tentative friendship with the other master, Claude Hulbert as Hilary Tisdaile, and together they navigate a curriculum steeped in superstition, superstition that seems to bear on the strange happenings around them.
Not long after his arrival, an ancient curse appears to reawaken at Dunbain Castle. The chilling sound of bagpipes accompanies the sudden deaths of staff members, and the body count begins to rise—two murders in quick succession that unsettle the quiet school. Lamb finds himself under suspicion as the list of possible culprits grows longer, even as the headmaster’s chair changes hands and the next potential victim sits at risk. To unravel the mystery, Lamb relies on the help of a mischievous, know‑all schoolboy, Percy Thorne, a character brought to life by Charles Hawtrey. Notably, Hawtrey was 26 years old when he portrayed Percy Thorne, a detail that adds a sly wink to the film’s playful tone.
As the investigation deepens, a Nazi spy ring is revealed to be behind the killings, cleverly concealed within the school’s walls and personnel. The adults and students alike become unwitting pieces in a larger game, and the culprit is finally unmasked by a quiet, resourceful British agent who has insinuated himself among the staff. This twist shifts the burden of truth onto the unfolding conspiracy, rather than mere local folklore, and the collaborators inside the school are forced to confront a danger that has used their ordinary routines as cover.
Among the film’s most memorable moments is a claustrophobic trap: Lamb ends up locked inside a hidden room as the ceiling slowly descends toward him. The danger escalates as the characters improvise a desperate escape, crouching beneath an iron table while the room’s supporting legs begin to bend and threaten collapse. Another striking beat comes when Mrs Wigmore, revealed as the traitor, attempts a dramatic escape with bullets that ricochet off the suit of armour worn by Hilary Tisdaile, underscoring the film’s blend of suspense and farce.
The finale blends danger, wit, and a touch of meta commentary. In a final backstage aside, Will Hay’s performance is punctuated by a moment of self‑awareness as he seems to break character, with the line of провoking playback letting the audience hear the actor’s surroundings. The moment is tied to the character of Hilary Tisdaile and the actor Claude Hulbert, creating a small, famous film anecdote that fans of the era often recall.
In the end, the mystery is resolved by exposing the spy ring and validating Lamb’s instinct that danger can arrive under the most ordinary of facades. The castle’s curse is confronted not by ritual alone but by the courage and quick thinking of those who refuse to be daunted by fear, tradition, or the echo of bagpipes. This blend of mystery, wartime setting, and sly humor remains a distinctive snapshot of British genre cinema, where a remote school, a hidden room, and a cast of memorable characters come together to deliver both chills and chuckles.
