"It's utterly impossible to solve that unless you have the book," he remarked; "therefore, why speculate, Miss Erith?"
"I'm going to try to find the book."
"How?"
"By breaking into the shop of Herman Lauffer."
"House-breaking? Robbery?"
"Yes."
Vaux smiled incredulously:
"Granted that you get into Lauffer's shop without being arrested, what then?"
"I shall have this cipher with me. There are not likely to be many books in the shop of a gilder and maker of picture frames. I shall, by referring to this letter, search what books I find there for a single coherent sentence. When I discover such a sentence I shall know that I have the right book."
The young man smoked reflectively and gazed into the burning coals.