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When an innocent man is sentenced to death for murder, his father takes matters into his own hands. A day before his son's execution, Canadian writer David Graham (Michael Redgrave) delves into England's criminal underworld and turns to increasingly desperate measures in an 11th-hour attempt to uncover any scrap of evidence that may exonerate his condemned son. Graham's search begins at the luxurious home of automotive industry giant Robert Stanford (Leo McKern). Wikipedia