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Zena Marshall endures a Dark Interval in this funereal British melodrama. Marshall plays the new bride of handsome and charming Andrew Osborn. No sooner does the honeymoon commence than Osborn drops his charm (though he's still pretty handsome). Marshall learns to her mounting horror that Osborn is hell on wheels when he's jealous--and he turns jealous at the slightest provocation. John Gilling, miles away from his horror classics of the 1960s, maintains a respectable level of suspense. Dark Interval is in and out in a breakneck 60 minutes, barely allowing us time to dwell on the plot inconsistencies.