paneling. Brittain got out, paid his fare, and went inside.

As the cab pulled away, Karnes gave orders for it to be picked up a few blocks away, just in case.

The rest of the vehicles began to surround the building.

Karnes, meanwhile, followed Brittain into the foyer of the apartment hotel. It was almost a mistake. Brittain hadn't gone in. Evidently attracted by the footsteps following him, he turned and looked back out. Karnes wasn't more than ten feet away.

Just pretend you live here, thought Karnes, and bully-boy will never know the difference.

He walked right on up to the doorway, pretending not to notice Brittain. Evidently, the saboteur was a little flustered, not quite knowing who Karnes was. He, too, pretended that he had no suspicions. He pressed a buzzer on the panel to announce himself to a guest. Karnes noticed it was 523; a fifth floor button.

The front door, inside the foyer, was one of those gadgets with an electric lock that doesn't open unless you either have a key to the building or can get a friend who lives there to let you in.

When Karnes saw Brittain press the buzzer, he waited a second and took a chance.

"Here," he said, fishing in his pocket, "I'll let you in." That ought to give him the impression I live here.

Brittain smiled fetchingly. "Thanks, but I—"

Bzzzz! The old-fashioned lock announced that it was open. Karnes stopped fishing and opened the door, letting Brittain follow him in. He stayed in the lead to the elevator, and pushed the button marked "4."

"You getting off before four?" he asked conversationally.

"No."

The elevator slid on up to four without another word being said by either man.

Karnes was judging the speed of the elevator, estimating the time it took for the doors to open as they did so, and making quick mental comparisons with his own ability to climb stairs at a run. The elevator was an old one, and fairly slow—

When the doors slid open, he stepped out and began to walk easily down the hall toward the stairway. When the elevator clicked shut, he broke into a run and hit the stairway at top speed, his long legs taking the steps three at a 

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