Biff Brewster was suddenly awake—wide awake. The gray light of dawn outlined the window of his first-floor bedroom. Something—or someone—was outside. He felt sure of it. Something had prodded him out of his deep sleep with startling suddenness.

For a moment he lay still, eyes on the window, his ears sharply tuned for the slightest sound. He knew, of course, that he might have been awakened by a stray dog, or a night-prowling cat. But he didn’t think so.

Very carefully, Biff slipped out of his bed. Bare-footed, he padded noiselessly toward the window, taking care to remain outside the dim shaft of early light coming through. He moved to one side of the window and peered out cautiously. He detected a slight movement beneath a gnarled apple tree about thirty feet away. Then suddenly, swiftly, a figure emerged from behind the protection of the tree’s drooping limbs. The figure came at a run toward the window. It was a man, small and slight of build. He was wearing blue jeans and a sweat shirt. On the shirt’s front there was an athletic letter—Biff couldn’t make it out—cut from luminous cloth, making it glow faintly in the dawn’s light.

Biff drew back, pressing his body against the wall. A moment later a white object, the size of a baseball, came hurtling into the room, tearing a hole in the screen. It fell with a dull plop on Biff’s pillow. Biff held his breath, waiting. The man was leaving the yard on the run. At the sidewalk, he slowed to a casual saunter. Apparently he did not want to risk attracting the attention of some early riser.

Biff waited. He counted slowly to a hundred, to make sure his strange visitor was gone. Once more he looked out the window. Nothing moved in the eerie light of the dawn. Biff turned away. Had he waited a few seconds longer, he would have seen two men leave the shadows of a corner tree and stealthily follow the hurler of the object.

Biff snapped on the reading light by his bed and picked up the object that had been tossed through his window. It was a round white rock, one of those used to outline his mother’s herb garden. More interesting was the heavy piece of twine tied tightly around it. At the other end of the twine was a ring. It was a man’s heavy ring, set with a square-cut green stone. Biff examined it carefully. The stone was dull, not glittering. He wasn’t sure, but he thought it was jade. He looked at the ring more closely. On its face there was an intricately etched marking. “A design?” he wondered. “No, it looks more like Chinese writing.”

Nothing moved in the 

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