told you that?" Isaac muttered.

"She told me that," Arnold assented. "What is there in it?"

Isaac looked at him for a moment with an intentness which was
indescribable. His black eyes seemed on fire with suspicion, with
searchfulness. At last he let go the arm which he was clutching, and
turned away.

"All right," he said. "Ruth shouldn't talk, that's all. I don't want
every one to know that I am reduced to printing my little sheet in
my bedroom. Good night!"

Arnold looked after him in surprise. It was very seldom that Isaac
vouchsafed any form of greeting or farewell. And then the shock
came. Isaac's companion, who had been leaning over the banisters,
waiting for him, had loosened the muffler about his neck and opened
his overcoat. His features were now recognizable--a pale face with
deep-set eyes and prominent forehead, a narrow chin, and a mouth
which seemed set in a perpetual snarl. Arnold stood gazing up at him
in rapt amazement. He had seen that face but once before, yet there
was no possibility of any mistake. It seemed, indeed, as though the
recognition were mutual, for the man above, with an angry cry,
turned suddenly away, buttoning up his overcoat with feverish
fingers. He called out to Isaac--a hurried sentence, in a language
which was strange to Arnold. There was a brief exchange of
breathless words. Arnold moved slowly away, but before he had
reached the street Isaac's hand was upon his shoulder.

"One moment!" Isaac panted. "My friend would like to know why you
looked at him like that?"

Arnold did not hesitate.

"Isaac," he said, gravely, "no doubt I seemed surprised. I have seen
that man before, only a night or two ago."

"Where? When?" Isaac demanded.

"I saw him hanging around the house of my employer," Arnold said
firmly, "under very suspicious circumstances. He was inquiring then
for Mr. Rosario. It was the night before Rosario was murdered."

"What do you mean by that?" Isaac asked, hoarsely.

"You had better ask yourself what it means," Arnold replied. "For
Ruth's sake, Isaac, don't have anything to do with that man. I don't
know anything about him--I don't want to know anything about him. I
simply beg you, for Ruth's sake, to keep out of trouble."

Isaac laughed harshly.

"You talk like a young fool!" he declared, turning on his heel.

CHAPTER XIV

SABATINI'S DOCTRINES

The apartments of Count Sabatini were situated in the somewhat
unfamiliar quarter of Queen Ann