East River, a high fence barred their way. It was plain wire, stretching to right and left out of sight—probably across the whole island.

"That wasn't on the map," said Dugan.

"Of course not," responded Kane. "That's the first line of defense. Touch it, and you'd alert the whole place." He didn't look unhappy about it, judging by the flash of his grin in the moonlight. "Brother, I think we've come to the right address!"

Vzryvov remarked imperturbably, "The road must pass through it yonder." He gestured to where an occasional moving light picked out the highway.

"Right," said Kane. They set out along the fence, keeping at a respectful distance from the wire.

The highway entrance was floodlighted and visibly protected by movable arms like those used at grade crossings. These, together with the sleepy squad of German soldiers that stood guard beyond the fence, would not have given pause to the invisible men. But there had to be invisible defenses too.

They waited on the shoulder of the in-going traffic lane. Manning and Dugan could scarcely quell the jittery feeling of being exposed in plain view of the enemy, but the others were unconcerned.

"We've got to hitch a ride," explained Kane softly. "Just passing through behind a vehicle wouldn't be good enough, you can bet...."

A car came rushing out of the darkness and swooped to a stop with screaming tires. It was a gleaming pleasure machine, transparent plastic top flung back to let the night air cool the heated faces of three young couples that occupied it, evidently on their way to continue in town a party that had outgrown the facilities of the countryside.

"Get a good look at their admission procedure," said Kane.

The guards bestirred themselves; one operated the gate mechanism, the rest surrounded the car, grasping shining steel blades on long shafts, barbed like medieval halberds. They swung their archaic weapons around and over the car, hacking the air viciously. The girls in the car squealed and snuggled as the driver eased forward under an interlocked arch of steel.

Manning said, "They're watching for us, all right!"

Kane nodded, then tensed as another automobile rolled up and stopped. "This one's O.K.," he said aloud. "Quick, 

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