Dr. Randall is mystified by the dropping of a dainty slipper on his shoulder as he is leaving the hotel. He examines the slipper carefully and has a vision of a lovely girl, whom his mind pictures must be the owner. Grace Villers, an orphan, occupies an apartment in the hotel. She has just had a strenuous struggle with her uncle and aunt, who have bound and gagged her. During the struggle she has succeeded in kicking one of her slippers through the open window. Dr. Randall is called to administer treatment to Grace, who is claimed by her uncle and aunt to be crazy. The doctor examines Grace, and she succeeds in conveying to him the information that her uncle and aunt are trying to make away with her to obtain her fortune. She whispers that a message contained in the slipper will explain the mystery. The doctor consults with the police and discovers the message concealed within the lining of the slipper. Grace is rescued and her fortune is restored, while Dr. Randall is rewarded with her heart and hand.
—Moving Picture World synopsis