"Quite a bit," Nancy answered meditatively. She was certain that she could not have been mistaken. Yvonne Wong was the same girl who only yesterday had waited on them in the Oriental shop. Why had she changed positions?

"Well," George broke into her thoughts, "don't keep us in suspense!"

Nancy answered all their questions as she drove toward River Heights, explaining that the young woman's name was Yvonne Wong and that she was a new girl in the office-the same office Nancy and Joanne had visited.

"But what about Yvonne's job at the Oriental perfume shop?" asked George.

"I don't know," Nancy admitted, "and the handyman wouldn't give me any indication as to the type of business it was !" Nancy recalled the strange telephone call which had been made while she and Joanne were in the office. She distinctly remembered that some mention had been made of a girl who had been found for the position, and that the man who called himself "Al" had said that one "couldn't be too careful."

"I wouldn't be so suspicious about Yvonne," Nancy added, "except I have a feeling she didn't get that job by chance. She must have been chosen because she was especially suited to the situation-whatever that is."

"There's something underhanded about the whole thing, but we haven't much to go on," Bess declared.

Nancy agreed. "Some clue may turn up. Anyway, we have Jo to think about for the time being."

It was getting dark as Nancy dropped off Bess and then George at their homes. It rained so hard the following day that Nancy stayed indoors and tried to figure out the remaining symbols of the code. Using the same alphabetical key, 16 was M, 5 equaled H, 2 could be B, and 18 stood for R.

"MHBR," Nancy pondered. "That doesn't make any sense. Perhaps those marks over and under the letters are a second code," she reasoned. "If only I could decipher them, I might know who's calling what meeting, and where."