A police detective investigates the murder of a young woman, and discovers that the crime is connected to her surviving twin sister and an extremely valuable stamp.
Time Out noted, "a brilliant opening sequence, otherwise this flat-footed British thriller is hampered by something like the world's worst script, including flashbacks no one would ever conceivably flash back to, and by a cumbersome storyline about big league stamp trading";[2] while Sky Movies wrote, "the spirit of the British crime movie of the Fifties lives on in this old-fashioned thriller about the hunt for a rare stamp - the Penny Gold of the title. Jack Cardiff directs with obvious affection for a genre long past but it's hard on such distinguished players as Francesca Annis and James Booth not to have more meat on which to bite."[3]
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