Rudolf's hands were indeed occupied: one held Bauer's arm, now no longer with a friendly pressure, but with a grip of iron; in the other the captive saw the revolver, which had till now lain hidden.
"You see?" asked Rudolf pleasantly. "You must ring for me, mustn't you? It would startle them if I roused them with a shot." A motion of the barrel told Bauer the direction which the shot would take.
"There's no bell," said Bauer sullenly.
"Ah, then you knock?"
"I suppose so."
"In any particular way, my friend?"
"I don't know," growled Bauer.
"Nor I. Can't you guess?"
"No, I know nothing of it."
"Well, we must try. You knock, and Listen, my lad. You must guess right. You understand?"
"How can I guess?" asked Bauer, in an attempt at bluster.
"Indeed I don't know," smiled Rudolf. "But I hate waiting, and if the door is not open in two minutes I shall arouse the good folk with a shot. You see? You quite see, don't you?" Again the barrel's motion pointed and explained Mr. Rassendyll's meaning.
Under this powerful persuasion Bauer yielded. He lifted his hand and knocked on the door with his knuckles, first loudly, then
