The vocaphone itself!
Quickly Kennedy turned another switch, of a rheostat, which accentuated a whisper to almost a shout.
"Don't be alarmed, Senorita," he cried. "This is Kennedy talking. Look under the bookcase by the window. You will find a cedar box. It is a detective vocaphone through which I can hear you and which is talking out to you. I have heard something just there just now—"
"Yes, yes. Go on!"
"You are threatened. Shout! Shout!"
Just then there came a sound of a scuffle and a muffled cry which was not much above a whisper, as though a strong hand was clapped over her mouth.
What could we do?
"Juanita—Juanita—help!—police!" shouted Craig himself through the vocaphone.
An instant later we could hear other screams as Juanita heard and spread the alarm, not a second too soon.
"Come on, Walter," shouted Kennedy dashing out of the room, now that he was assured the alarm had been given.