"Can you get out?"
"Certainly. I have that same private entrance down beside the house wall and the same tunnel I used before. I'll see you in about fifteen minutes."
In Brookings' office, DuQuesne told of the constant surveillance over him.
"They suspect me on general principles, I think," he continued. "They are apparently trying to connect me with somebody. I don't think they suspect you at all, and they won't unless they get some better methods. I have devices fitted up to turn the lights off and on, raise and lower the windows, and even cast shadows at certain times. The housekeeper knows that when I go to my library after dinner, I have retired to study, and that it is as much as anyone's life is worth to disturb me. Also, I am well known to be firmly fixed in my habits, so it's easy to fool those detectives. Last night I went out and watched them. They hung around a couple of hours after my lights went out, then walked off together. I can dodge them any time and have all my nights free without their ever suspecting anything."
"Are you free tonight?"
"Yes. The time-switches are all set, and as long as I get back before daylight, so they can see me get up and go to work, it will be all right."
Brookings told him briefly of the failures to secure the solution and the plans, of the death of the three men sent to silence Shiro, and of all the other developments. DuQuesne listened, his face impassive.
"Well," he said as Brookings ceased. "I thought you would bull it, but not quite so badly. But there's no use whining now. I can't use my original plan of attack in force, as they are prepared and might be able to stand us off until the police could arrive."
He thought deeply for a time, then said, intensely: