"Innocent looking little job, isn't it?" she remarked. "Used to belong to an undertaker." She hopped in. When, with a sad shrug, Phil followed her, he was hardly surprised to find she had donned a full-length black evening-mask. "It's not my car," she explained. "I'm just hiding it for Carstairs and the gang. It's hot." And with that reassuring remark she guided it out toward the ramp, its small electric motor whining faintly. A door rose at her voice. Then they were outside in the ghostly yellow evening of the sodium mirror. When they had climbed almost to ground level, a big car slammed to a stop in the street ahead, three-quarters blocking the exit. Two men jumped out of the car and someone, of whom Phil could for the moment see only waddling legs and chubby tummy, hurried to meet them. "Look, if this is another tame-chicken chase--" he heard the first of the two men from the car begin in heavy skeptical tones. "Don't be absurd," the hurrier asserted crisply in a voice Phil recognized as Dr. Romadka's. "I tell you, he mentioned the green cat." At that moment the analyst looked around and saw Phil gawking at him. "There he goes now!" The analyst's outraged squeal turned to the rasp of plastics as Mitzie bullied the small black car between the ramp-wall and the newcomer. With the twang of hooked bumpers parting, they swung out into the street, the little electric accelerating modestly. Phil looked over his shoulder. "They've got back in," he told Mitzie. "They're turning around." "Like I said, you're important," she murmured through her mask, still incredulously. "Well, here goes," and she abruptly nosed the car toward the narrow mouth of a ramp leading downward. "Hey, that's marked 'Exit Only,'" Phil yiped at her. "That's why I'm using it," she informed him curtly. He closed his eyes as the car tilted sharply down, but the gods of probability seemed inclined to grant boons tonight. When the car leveled out, Phil opened his eyes to the brighter, nearer, fog-light sodium yellow of the under level. They were moving ahead smartly. Once more Phil looked back. "They've come down after us," he said with wonder perhaps a trifle mixed with pride. "Really important," Mitzie muttered, shaking her head. "Well, this little mouse was never meant to outrace that rhino. Prepare for acceleration, and hope the cars at the next ten intersections are stacked right."