"Aye, aye, sir!" George said mockingly. "We're at your service! But be careful!"

Nancy alighted, hurried up the street, and went into the building. The halls were deserted. Evidently the girl had gone into one of the offices. But which one? As Nancy stood uncertainly staring up and down, she spotted a handyman coming down the corridor.

"Did you see a girl come into the building just a moment ago?" she inquired.

"Oriental?" the man demanded, resting on his broom.

Nancy nodded eagerly. "Yes, she looks rather Oriental."

"Oh, you mean Yvonne Wong."

"Do you know her?" Nancy said, thinking that with the name Yvonne, the girl was probably part French.

"No, but I heard that man she works for, with the loud voice and the swell clothes, call her by that name."

"She works here?" Nancy inquired in surprise.

"Guess so. She must be a new girl. Came here yesterday."

"I see," Nancy murmured, thinking Yvonne Wong had managed a rather sudden change of jobs. "Could you tell me in which office she works?"

Her questions evidently had begun to annoy the handyman. "In 305. If you're so interested," he said brusquely, "why don't you go in and ask her what you want to know?"

"Thank you," Nancy responded with a polite smile, turning away. "I won't trouble you any further."

Nancy had taken only a few steps when she thought of one more question and came back. "By the way," she said in a casual tone, "what sort of office is 305?"

The man regarded her suspiciously. "How should I know?" he demanded bluntly. "They don't pay me to go stickin' my nose in other folks' business. I got my own work."

Nancy could see that she was not going to learn any more from the man, so she left the building and joined Bess and George, who were waiting anxiously at the door.

"Well, what did you manage to find out?" Bess queried, as the three girls walked toward the car.