Through his sleep he heard a door close down below, and sat bolt upright in bed, his heart pounding wildly. Only a tiny sound, the click of a closing door-- Ann was sitting up beside him, brown hair close around her head, her body tense. "Roger!" she whispered. "Did you hear something?" Roger was out of bed, bounding across the room, into the hall. Blood pounded in his ears as he rushed to David's room, stopped short before the open door. The shots rang out like whip cracks, and he saw the yellow flame from the guns. There were two men in the dark room, standing at the bed where the boy lay rolled into a terrified knot. The guns cracked again and again, ripping the bedding, bursting the pillow into a shower of feathers, tearing the boy's pajamas from his thin body, a dozen blazing shots-- Roger let out a strangled cry, grabbed one of the men by the throat, in a savage effort to stop the murderous pistols. The other man caught him a coarse blow behind the ear, and he staggered hard against the wall. Dully he heard the door slam, heavy footsteps down the corridor, running down the stairs. He struggled feebly to his feet, glancing at the still form on the bed. Choking back a sob he staggered down the hall, shouting to Ann as he went down the stairs, redoubling his speed as he heard the purr of autojets in the driveway. In a moment he was in his own car, frantically stamping on the starter. It started immediately, the motor booming, and the powerful jet engines forced the heavy car ahead dangerously, taking the corner on two of its three wheels. He knew that Ann would call Security, and he raced to gain on the tail lights that were disappearing down the winding residential road to the main highway. Throwing caution to the winds, Roger swerved the car across a front lawn, down between two houses, into an alley, and through another driveway, gaining three blocks. Ahead, at the junction with the main Base highway he saw the long black autojet turn right. * * * * * Roger snaked into traffic on the highway and bore down on the black car. Traffic was light because of the late hour, but the patrol was on the road and might stop him instead of the killers. The other car was traveling at top speed, swerving around the slower cars. Roger gained slowly. He fingered the spotlight, preparing to snap it in the driver's eyes. Taking a curve at 90, he crept up alongside the black car as he heard the siren of a patrol car behind him. Cursing, he edged over on the black car, snapped the spotlight full in the face of the driver-- The screaming siren forced him off the road, and he braked hard, his hands trembling. A patrolman came over to the car, gun drawn. He took a quick look at Roger, and his face tightened. "Mr. Strang," he said sharply. "We've been looking for you. You're wanted at Security." "That car," Roger started weakly. "You've got to stop that car I was chasing--"