Henry’s tone, though studiously moderate, was extremely firm. “There is undoubtedly a leak, and, in view of Formula ‘B,’ it is vital that the leak should be found and stopped.”

He addressed himself to Lady Heritage:

“Sir William tells me that all employés correspond with the list in my possession, that none of them leave the enclosure, and that all letters are censored. By the way, who censors them?”

“Ember,” growled Sir William.

Lady Heritage elaborated the remark.

“Mr. Ember—Father’s secretary.”

She and Henry were both standing, with the corner of the writing-table between them. She saw inquiry in Henry’s face. He said:

“Who does leave the premises?”

“Father, once in a blue moon, I when I have any shopping to do, and, of course, Mr. Ember.”

“And when you go you drive, of course? What I mean is—a chauffeur goes too?”