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Rod Slater (Roger Moore) becomes involved in a web of intrigue following a rock fall at a South African gold mine owned by Harry Hirschfeld (Ray Milland), in which general manager and veteran miner Frank Lemmer is killed. Hirschfield's managing director, Manfred Steyner, is plotting with financier Farrell (John Gielgud) to flood the Big Dyke, thus destroying the mine and raising the value of gold worldwide, and tricks Slater into excavating the seam of gold beyond the river. Meanwhile, Slater becomes passionately involved with Steyner's wife (Susannah York), unaware that the scheme hatched by her husband will result in his death.
