"Only watch and follow him.

Every movement he makes is of interest.

Unconsciously he may be giving us invaluable clews." And he approached the door to note for himself what the man might do.
"Remember Evelyn!" rang out the startling cry from above, as the detective passed between the curtains.

Irresistibly he looked back and up.

To whom was this appeal from a bird's throat so imperatively addressed?
To him or to the man on the floor beneath, whose ears were forever closed?
It might be a matter of little consequence, and it might be one involving the very secret of this tragedy.