He glided through the opening, and his form slipped to the top of the elevator below. Black-clad hands closed the mezzanine doors.
Detective Sergeant Mayhew was arriving at the mezzanine. His form was plainly visible as he reached the lighted area in front of the stairway.
He was seen by the hidden man who crouched upon the top of the elevator. But that figure in the darkness of the shaft was totally invisible.
The elevator moved upward. It ascended floor by floor until it reached the ninth. There it stopped, in accordance with orders. Then it moved downward.
The black figure was no longer with it. The Shadow had abandoned the top of the elevator. He was clinging to the doors of the tenth floor.
There, his work was difficult. He supported himself with his right arm, while his left painfully worked to spread the doors.
Under the exacting circumstances, he did not totally avoid a noise; but the opening of the doors was no more than a dull sound. The Shadow emerged from the elevator shaft.
He closed the doors carefully, and moved slowly toward the door of Harshaw’s apartment.
By his ingenious artifice, The Shadow had reached the tenth floor without running the gamut of watching men. The only obstacle now might be some one stationed in the apartment.
That was unlikely. The Shadow had a divining mind. Mayhew’s descent was a sign that the tenth floor was deserted, but that the path to it was blocked. Nevertheless, The Shadow was cautious as he unlocked the door of the apartment.