"Well ... you're in good health, I'd say." Barney smiled. "But suppose
something did happen to you before you succeeded in shutting the
McAllen Tube down." He inclined his head toward the locked door.
"That thing would still be around waiting for somebody to open it and
step through...."
McAllen's expression of concern vanished. He dug a forefinger
cheerfully into Barney's ribs. "Young man, you needn't worry. I've
been aware of the possibility, of course, and believe me I'm keeping
_very_ careful notes and instructions. Safe deposit boxes ... we'll
talk about that tomorrow, eh? Somewhere else? Had a man in mind, as a
matter of fact, but we can make better arrangements now. You see, it's
really so ridiculously _easy_ at this stage."