"This is the face of terror: Anne Marie Henderson, eighteen years of age, her young existence suddenly marred by a savage and wholly unanticipated pursuit by a strange, nightmarish figure of a woman in black, who has appeared as if from nowhere and now at driving gallop chases the terrified girl across the countryside, as if she means to ride her down and kill her - and then suddenly and inexplicably stops, to watch in malignant silence as her prey takes flight. Miss Henderson has no idea whatever as to the motive for this pursuit; worse, not the vaguest notion regarding the identity of her pursuer. Soon enough, she will be given the solution to this twofold mystery, but in a manner far beyond her present capacity to understand, a manner enigmatically bizarre in terms of time and space - which is to say, an answer from the Twilight Zone."Anne has to make a decision between David, the man she loves, and Robert, the man her father wishes her to marry. Twenty-five years later, Anne is now an alcoholic, and her husband has gone through her family's money. It is she who chases her younger self trying to warn her not to marry the wrong man. But the wrong man ends up being David, not Robert.
"This is the face of terror: Anne Marie Mitchell, forty-three years of age, her desolate existence once more afflicted by the hope of altering her past mistake - a hope which is, unfortunately, doomed to disappointment. For warnings from the future to the past must be taken in the past; today may change tomorrow, but once today is gone tomorrow can only look back in sorrow that the warning was ignored. Said warning as of now stamped 'not accepted' and stored away in the dead file in the recording office of the Twilight Zone."