"None."
"Then it is clear that the substitution must have been effected between the time you left your office last night, and your arrival here this morning."
"Yes."
"Was this possible?"
"Undoubtedly. I left my office last night about six. It is never locked. The caretakers, the women who clean the offices, were in there later, and from seven to nine this morning it would also have been a simple matter for anyone to enter and make the change."
Duvall turned to Mr. Baker.
"It's the same story," he said. "Someone who works in the building is responsible for this thing, or else is able to bribe one or more of your employees to act for them. But we won't get very far looking for the guilty person, with several hundred people to watch and no clues whatever to go on. Suppose we go back to your office, and I will tell you what I had in mind about this evening."
"Is Miss Morton able to go on with the scene?" Baker asked, as Edwards started away.
"No. She seems all broken up. I don't think she is very well. Her mother is going to take her home, as soon as she feels better."
"Will you ask Mrs. Morton to wait a little while, Mr. Edwards? Tell her that Mr. Duvall will join her presently, and go back to the city with her." Mr. Edwards nodded, and withdrew, and Duvall and Mr. Baker retired to the latter's private office.