Where could this unprotected girl be going, alone and in a hotel cab?
"I could not imagine, and when I saw Madame stop in the middle of her talk to buy some fresh flowers and pin them to Miss Willetts' corsage, I got a queer feeling, and flinging my newspaper aside, I strolled to the door and so out in time to hear Madame's orders to the chauffeur.

The young lady was to be taken to a museum.

To a museum, at this early hour! and alone, alone! Such a proceeding is not at all in accord with French ideas, and I feared a plot.

Though it was far from being my affair, I determined to make it so; and as soon as I dared, I followed her just as I had followed her from the dock.

But fruitlessly! Not knowing the danger, how could I avert it?
I was in one gallery, she in the other.