Just plain Mary Ann, that's all, but there is something about this little country girl which stamps her as the right sort, with grit, grip and gumption to distinguish her among the famous men and women of the twentieth century, or any other century for that matter. Her father is a faithful old servant in the employ of the D.&C.R.R. as a signal man in a tower on the lonely stretch of the track at very important junction. After his day's work, Mary Ann, who has studied telegraphy and likes to practice, comes to the tower to go home with her father, after the night signal man comes to relieve him. The night man is somewhat delayed and her father leaves Mary Ann at the signal station while be goes home to get his supper and rest.