As Bob listened he could hear the almost noiseless movements of the other man and knew that he was nearing the door. Then he heard hands moving along the woodwork—finally the gentle turning of the doorknob. Then there was the sharp rattle of the knob as though a sudden wave of anger had swept over the man at the realization that he had been trapped in the room.
Bob moved away from the door, crawling on his hands and knees, and he kept going until he was well down the room and right at the steel cabinet where the radio documents were filed. With cautious hands he felt along the front of the case. So far the drawers had not been pulled out for they were identified only by key numbers instead of by the name of the type of papers which they contained.
This was one cabinet Bob was determined to protect, for, after what his uncle had told him earlier in the night, he felt sure that this was the object of the unknown’s visit.
Once more the doorknob was rattled sharply; then silence again shrouded the room and Bob felt his nerves tightening. It was tough waiting alone in the darkness. He wondered if the other man possessed a gun and if he would have the nerve to use it if an emergency caught him.
Bob strained his ears for some sound of the other’s maneuvers. A faint sort of “plop” made him smile. It sounded very much like a shoe being placed gently on the floor. Several seconds later there was a similar sound and Bob knew that they were now on even terms; neither one of them having his shoes on. This man was no fool; he was determined to keep his own movements as secret as possible.
Then Bob heard a sound which was anything but heartening. The unknown was coming toward him. He could hear the gentle scrape of knees as the man crawled along the floor. He was evidently feeling his way along the filing cabinets and Bob moved out toward the center of the room where he found protection between two desks, set fairly close together.
His action was not a minute too soon, for he had barely settled himself in his new position when he saw a darker shadow moving along in front of the filing cases. The man was less than six feet away, and breathing very quietly, but steadily.
Bob held his own breath as the man passed along the row of filing cases. Evidently he was going to make the rounds of the room in an effort to catch Bob by surprise, overpower him, and take away the key. Bob chuckled inwardly at that thought. He was too familiar with the room to be caught in that manner.
Moving out slightly from behind the shelter of the desks, he saw the man reach a window and raise his head so that he could look down on the street. It was a temptation that Bob couldn’t resist and he picked up an inkwell on the desk beside him, took careful aim, and hurled the heavy glass container.
Just as he threw the inkwell, Bob slipped and the noise attracted the attention of the other man. He leaped to his feet and whirled about. The glass container, instead of striking the man’s head, hit his shoulder, glanced into the window and crashed its way on out into the darkness.