"All right," Cecil said. "Only just remember, if we decide to keep the corpse, there mustn't be any blood on it. I can't stand blood; it's so common."
At that point the brothers turned to observe Toffee with expressions of small annoyance.
"What about her?" Gerald said. "Hadn't we better chain her up again?"
Cecil nodded. "And we'd better make sure Pillsworth doesn't go to sleep. You stick by him and keep him awake while I work on the formula."
With that the brothers parted, in pursuit of their individual duties. Cecil returned Toffee to her chair and her chains. Toffee told Marc about the truth serum and the formula.
"Oh, Lord!" Marc said. "They'll destroy the city!"
"I know," Toffee said. "I know."
After that the hours wore on endlessly. Cecil busied himself with Mr. Adams' machine, adjusting dials, turning knobs, throwing switches with hateful diligence. Cecil stuck to Marc and Toffee as per plan. Alternately he gave Marc food to keep him earthbound and powders to keep him awake. In between times, he talked. He explained about the bomb shell that he and Cecil had completed during the night while Marc was unconscious.
A small chamber was to contain the final chemical. Through a device to be set when the bomb was launched, the chemical would be released into another small chamber which was adjacent to the main body of the bomb and separated from it only by a very thin metal diaphragm. In a predetermined period of time the diaphragm would be eaten away by chemical reaction. In that way all the chemicals would be united at precisely the right moment to produce the explosion.
The moment of detonation was to be timed so that it occurred in the air directly above the target. The chemicals would be scattered in a fine spray over the desired area. It was all very precise and exact.