"When'll you go?" she whispered in tones inaudible to Mueller.
"I don't know," he answered, his voice unchanged. "I'll have to make some sort of preparations—and I don't want you to know."
She nodded. She gazed at him a moment longer with tear-bright eyes. "Good-bye, Nick," she whispered. She rose on tiptoe, and kissed him very lightly on his lips, then turned and walked quickly away, with Mueller following behind.
She walked on, ignoring him until he halted beside her at the crossing of the Drive. Then she gave him a cold glance.
"Why is Dr. Carl having him watched?" she asked.
Mueller shrugged. "The ins and outs of this case are too much for me," he said. "I do what I'm paid to do."
"You're not watching him now."
"Nope. Seemed like the Doctor would think it was more important to get you home."
"You're wasting your time," she said irritably as the lights changed and they stepped into the street. "I was going home anyway."
"Well, now you got company all the way." Mueller's voice was placid.