"I don't know yet."
Vaux smiled. "All right; go ahead, my dear Miss Erith. You're officially detailed for this delightful job. Do it your own way, but do it—"
"Thank you so much!"
"—In twenty-four hours," he added grimly. "Otherwise I'll turn it over to the P.I."
"Oh! That IS brutal of you!"
"Sorry. But if you can't get the code-book in twenty-four hours I'll have to call in the Service that can."
The girl bit her lip and held out her hand for the letter.
"I can't let it go out of my office," he remarked. "You know that,
Miss Erith."
"I merely wish to copy it," she said reproachfully. Her eyes were hazel.
"I ought not to let you take a copy out of this office," he muttered.