This dynamic and tightly scripted drama centres on the search for the perpetrators of a multi-million-pound gold bullion robbery; Peter Vaughan stars as the C.I.D. officer doggedly tracking down all those who hold clues to the identity of the mastermind behind the raid. Vaughan's strong performance is supported by some of the key dramatic actors of the late '60s, including Joss Ackland, Alfred Lynch, George Cole, Bernard Hepton, George Innes, Roy Dotrice and Peter Bowles.