The plot revolves around a train journey, where Miss Froy vanishes.
She’s the lady in the title.
The mystery is solved and it’s a very happy ending all round when, not only is Miss Froy alive, but the two lead stars plan their own wedding.
Miss Froy was played by May Whitty, who was born in the year that the American Civil War ended (1965).
The connection with history isn’t such a big bridge after all when you trace back connections.