There was still the broken skylight in the room which Lenora had occupied, and the bed upon which she had slept was still crumpled.

French, who had been tapping the walls downstairs, called to them.

They trooped down into the hall.

The Inspector was standing before what appeared to be an ordinary panel.
"Look here," he said, glancing out of the corner of his eye to be sure that Laura was there, "let me show you what I have just discovered." He felt with his thumb for a spring.

In a moment or two a portion of the wall, about two feet in extent, slowly revolved, disclosing a small cupboard fitted with a telephone instrument.
"A telephone," the Inspector remarked, pointing to it, "in an unoccupied house and a concealed cupboard.