Diana Hyland stars as Anne Marie Henderson, 18 years-old in 1939 who is being terrorized by a mysterious black-clad older woman on horseback who chases and screams at her. Anne returns home to her parents, who are with a young man named Robert that they want her to marry, but she is still in love with another man named David, with whom she does in fact run away with and marry, though 25 years later, her life a bitter disappointment, now understands who that dark rider was, and why she chased her... Reasonably eerie episode isn't quite as effective as it might have been(identity of the rider is obvious), but Hyland is quite good here, and unexpectedly ironic climatic twist is memorable.