Read "The Mysterious Mr. Miller" by William Le Queux online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
The man with the grey hat took the pocket-knife, knelt over the spot, placed the knife in position, and pressed with all his might, when slowly a panel of the oak wainscoting about two feet square fell forward until it lay flat at right angles, disclosing a small locked door behind.
"This is it, no doubt! " cried the doctor, tugging at the door. It yielded, disclosing a secret cupboard.