"Flash it momentarily out of each of the suspected windows in turn until you get an answering flash from here. When you do, flash it out of each pane of glass in the window until you get another flash from here. Then come back and tell me what office it is. Mark the pane so that we can locate it again in the morning."
"It is the office of the Assistant to the Adjutant General of the Army," reported Bolton ten minutes later.
"What is there in the room?"
"Nothing but the usual desks and chairs."
"I suspected as much. The window is merely a reflector. That is all that we can do for to-night, gentlemen. Admiral, keep your patient quiet and in a room with glass windows, preferably with the shades drawn, until further notice. Bolton, meet me here with Carnes at sunrise. Have a picked detail of ten men standing by where we can get hold of them in a hurry. In the mean time, get the Chief of Air Service out of bed and have him order a plane at Langley Field to be ready to take off at 6 A. M. He is not to take off, however, until I give him orders to do so. Do you understand?"
"Everything will be ready for you, Doctor, but I confess that I don't know what it is all about."
"It's the biggest case you ever tackled, old man, and I hope that we can pull it off successfully. I'd like to go over it with you now, but I'll be busy at the Bureau for the rest of the night. Drop me off there, will you?"
At sunrise the next morning, Bolton met Dr. Bird at the entrance to the White House grounds.
"Where is your detail?" he asked.