Evil lurks in the gloomy house at Markham Manor where a deranged Sir Edward is the chained prisoner of his brother Julian. When Sir Edward escapes, he embarks on a monstrous killing spree, determined to seek revenge on all those whom he feels have double-crossed him.
Edgar Hill returns to his ancestral home in Cornwall after hearing of his brother Julian's death. He finds the estate in disrepair and is haunted by rumors of Julian's madness and grotesque experiments. As Edgar investigates, he uncovers dark family secrets involving a hidden sibling, a vengeful curse, and a horrifying transformation that may have led to Julian's demise.
The Oblong Box is a typical Hammer Horror-esque film, leaning into atmospheric dread and gothic settings. While not among Vincent Price's most acclaimed roles, it is generally regarded as a solid entry in the genre, appreciated for its suspense and Price's performance, though some critics found the plot convoluted.
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The film was shot in England, but several scenes were filmed on location in the Italian town of Portofino, doubling for a jungle in Africa.
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