When two drovers are found dead on the Western Trail near the Texas town of Cutter's Crossing, marshals Hank Ross and Abe Naylor aim to find their killers and bring them to justice. But their task is complicated when the local schoolteacher, Alice Carnaby, is kidnapped by the drovers' killer, who heads for Mexico with her. Ross and Naylor join forces with George Bowman, a half-breed Indian tracker, and set out after them. However, an unscrupulous local rancher has his own reasons for making sure the marshals don't succeed in freeing Alice, and sends four men to kill both her and the marshals. The rancher is determined there will be no witnesses - and therefore no trial ...