Cecil glanced at his wrist-watch.
“Time’s getting on, Foxy. We’ve sketched the general idea, but we must get this thing down to dots now. Everything will depend on synchronizing things exactly. We can’t afford to leave affairs to the last moment; for we mustn’t be seen together, you know, to-morrow night.”
Foxy nodded assent and pulled out a notebook.
“Here it is, then,” he declared. “I’ll make three copies—one for each of us—and we can burn ’em once we’ve memorized ’em later on. Now, first of all, we can’t start our game too early. That’d be a mistake. Let ’em all get well mixed up in dancing and so forth, before we begin operations.”
Cecil and Una assented to this at once.
“Midnight’s the limit at the other end,” Foxy pointed out. “Can’t afford to wait for the unmasking, for then the keeper would know us and remember we’d been in the museum when the thing happened.”
His fellow-conspirators made no objection.
“In between those limits, I think this would be about right,” Foxy proposed. “First of all, we set our three watches to the same time. Better do it now, for fear of forgetting.”
When this had been done, he continued:
“At 11.40 Una goes to the main switch. You’ll have to show her where it is, Cecil, either to-night or to-morrow morning. At 11.40, also, Cecil and I wander independently into the museum. I remember quite well where the medallions are kept.”