Mademoiselle is a part-time spy hunter.
That in itself is a far exaggeration because she has not training as such in any capacity. She is simply a very attractive, quite appealing young woman who is gifted with the ability to talk to people and to make them feel comfortable talking back. She will be asked to use this charm to help out on two known occasions, one of them to trap a spy and the other to catch a thief.
So why does that qualify her for membership in this compendium? Well, it probably does not except that the recording of her two "missions" were captured back in the days of silent movies, in black and white, of course, and the spy-related aspect of the first adventure definitely makes it notable.
We quickly gain a lot of 'unspoken' information about the main character very early in the first adventure. Unfortunately, what her name actually might be is not one of them. In fact, we would go through both of the stories without ever knowing what she is called, other than the standard 'Mademoiselle' used to address any young woman working in a cafe in France at the time.
We know that her new British soldier boyfriend in the first story is named Johnny but since his real name is John Smith, we have to just assume it to be real. When in the second adventure we find that the lovely main character is now married to Johnny and has moved to London with him after the Great War is over, we at least know that Mademoiselle is now Mrs. Smith.
We also know that she is very attractive and comely and has quite observant, so much so that twice we will find her being asked to watch and investigate suspected ne'er-do-wells. Her skills in this matter will be enough to foil the espionage plans of a German agent and the thievery spree of a crooked entertainer as well.
And we know by the way that she pursues her loved Johnny into the trenches to prove her devotion to him shows she is as intrepid as them come. Not to mention resourceful and not a little bit on the lucky side.