Read "The Secret of the Old Mill" by Franklin W. Dixon online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
Three days later, Fenton Hardy, who had been away from home on business, received a note.
No one saw the man who left it at the door. The Hardy boys were at school and Mrs. Hardy was busy in the kitchen. She heard the front doorbell ring and went to answer it.