"We've the strongest kind of evidence," Fenton said, "short of what an eye-witness would be able to tell us. No jury could listen to expert testimony regarding it, and stay locked up for more than ten or fifteen minutes." He paused for a moment to stare around the office. His gaze lingered for an instant on Ellers and it seemed to Lynn Prentiss--up to that moment her own gaze had rested on Macklin and the detective--that the elderly editor paled slightly. But Hansen and Eaton appeared ill at ease too, the publisher extremely so, and even Susan Weil grew a little restive under the big detective's prolonged scrutiny. It was to Susan that he spoke. "The switchboard keeps you pretty busy, doesn't it, Miss Weil," he said. "If someone came out of one of the offices on this side of the reception desk and darted past you--I'm using that word deliberately because it describes the way he probably moved--it would be quite possible for him to reach Miss Lathrup's office on the other side of the desk-division unobserved, I should imagine. Your back would be turned, because the switchboard faces toward the outer door. Isn't that so?" Susan wet her lips before replying. But her answer was decisive enough. "Yes, sir. I'm quite sure I wouldn't have seen him, if I was plugging in a call." "Then, if he'd darted back again a few moments later, it stands to reason you wouldn't have seen him then either ... if you happened to be answering another call or even--if you just happened to have your back turned. It would have been very easy for him to pause an instant before darting back to make sure that your back would be turned." Susan nodded. "That's right, sir. When someone comes into the outer office I usually see him right away, because I just have to glance sideways. But I seldom turn around and look behind me, unless an editor speaks to me. Editors pass back and forth all the time and even when I hear them I seldom turn around." "I see," Fenton said. "That would have cut down the risks for him, made it even easier. But I imagine he did his best to dart past as quickly and silently as possible. Did you hear the sound of the silenced gun, Miss Weil?" "Yes, I'm sure I did. But it didn't make much of an impression on me, until Miss Prentiss came out a minute or two later and told me that she'd heard it also. It seemed to trouble her a great deal." "Yes, well--that's all I wanted to know." He looked directly at Lynn. "How long was it, Miss Prentiss, before you got up, after hearing the sound, and went to investigate? I questioned you about that on the day of the murder, but it wasn't of such vital importance then. I mean--it didn't seem so to us at the time. It should have, and I blame myself for it. Please try to think back again, and narrow it down as much as you can. A half-minute, a minute and a half?"