A shouting wave of men rioted through the engine room. From the bridge above the hulking atomics, Chief Engineer Durval vollied orders in a thunderous voice. "You men—you!" he raged. "Use your heads, not your feet. Drive them toward the door." A scattering of Them—compact darting beasts the color of a poppy—scuttled into the shadow of an engine. Heavy Davison wrenches clubbed futilely behind them. As Durval flew into new bursts of shouting, Scott Jerill, First Mate of the freighter Bertha , grim