Anthony Hopkins plays Philip Calvert, a British secret agent tasked with solving a series of gold bullion robberies in Scotland.
Robert Morley portrays Uncle Arthur, a wealthy landowner and friend of Philip Calvert who aids him in his mission.
Nathalie Delon takes on the role of Charlotte, a mysterious woman who becomes intertwined with Philip Calvert.
Jack Hawkins stars as Sir Anthony Skouras, a high-ranking British government official involved in the investigation.
Corin Redgrave plays Hunslett, a member of Philip Calvert's team assisting in the operation.
Derek Bond portrays Lord Charnley, another figure involved in the gold bullion investigation.
Ferdy Mayne plays Lavorski, a suspect in the gold bullion robberies that Philip Calvert is tracking.
Maurice Roëves appears as Lt. Williams, the helicopter pilot helping Philip Calvert in his pursuit of the criminals.
Leon Collins takes on the role of Tim Hutchinson, a member of Philip Calvert's team involved in the operation.
Wendy Allnutt portrays Sue Kirkside, a character intertwined in the mysterious events surrounding the gold robberies.
Peter Arne plays Capt. Imrie, a military figure aiding Philip Calvert in the investigation.
Oliver MacGreevy takes on the role of Quinn, a suspect involved in the gold bullion heists.
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