Jack reflected a moment.
“Will you let me go if I will promise to keep your secret?” he asked.
“How could I be sure you would do it?”
“I would pledge my word.”
“Your word!” Foley snapped his fingers in derision. “That is not sufficient.”
“What will be?”
“You must become one of us.”
“One of you!”
Jack started in surprise at a proposition so unexpected.
“Yes. You must make yourself liable to the same penalties, so that it will be for your own interest to keep silent. Otherwise we cannot trust you.”