Startled by a sharp click, he turned around. The robot was whirring into life. Fast workers, whoever Shelton's enemies were, and up early! He found the pinch bar with which he had wrecked the television apparatus and, with a few mighty blows, destroyed the antenna and headpiece of the mechanical man. They'd not pull off any devilment with this one, anyway.
A wave meter on one of the benches attracted his attention and he twirled its knob. It gave strong indication at one and a half meters. The wave length of their control transmitter! If only he could find—but there it was: a direction finder. Hastily, he lighted its tubes and tuned to the frequency shown by the meter. He rotated the loop over the compass dial and carefully noted maximum and minimum signals. He had a line on the transmitter! And it must be close by, for the intensity of the carrier wave was tremendous.
lipping the automatic into his pocket, he left the laboratory and struck out through the underbrush in the direction Carlos had taken the day before. Fighting his way through the tangled shrubbery, he kept his eyes constantly on the needle of the magnetic compass he had wrenched from the direction finder. It was tough going through the thicket, and just as bad across a swampy clearing where he was mired to the knees before he got across. Up the hill and into the woods he forged, keeping doggedly to the direction he had determined. This was rough country, less than a hundred miles from New York but uncultivated and unsettled excepting for the few summer places along the shore. He'd heard that these backwoods were infested with rum-runners and hijackers, a cutthroat gang.
There was a cabin off there through the trees, almost on the line he was following. Must be what he was looking for. He advanced cautiously, creeping stealthily from tree to tree.
Voices came to his ears, and the throb of a motor-generator. It was the place, all right. He crept closer, and, circling the house, saw that an almost impassable road led to it from the rear. A heavy limousine was parked there in the trees, and another car, a yellow roadster—his own. A feeling of grim satisfaction was quickly dispelled by the sound of a familiar humming. Within a foot of his ear, it seemed to be, and instinctively he ducked.
Click! A powerful clamp had fastened itself to his wrist. One of Shelton's invisible robots! He struck blindly at the unseen monster and was rewarded by a shooting pain up his wrist as one of his knuckles was driven backward by the impact with the hard metal. Bands of writhing metal encompassed his body, pinning his arms to his side and lifting him bodily from the ground. There he hung, kicking and struggling in mid-air, supported by nothing he could see. He closed his eyes and felt of the thing that held him. Cold, hard metal it was—implacable and unyielding.
Clank, clank. The monster was walking with long, jerky strides. The pressure against his ribs brought a gasp of agony from his lips. Each jarring step was an individual and excruciating torture. His breath was cut off by the relentless constriction of one of the tentacles which now encircled his neck. It wouldn't be long now.