"They are often very cunning," replied the mother.
"Can it be Harry Arnold would employ such an agent?" asked Emily, still trembling.
"Twice," said Shagarach, as if speaking to himself. "A cap and a button. Men have been captured on slighter clews."
"You will give the button to Mr. McCausland," said the mother.
"Yes; since it fits with the cap."
"Maybe he will help you to bring Harry Arnold to justice."
"And so to acquit Robert Floyd," said Shagarach, smiling to cheer his guest.
The mention of her lover restored the wilted girl, who was brave enough when there was anything definite to be done. Shagarach showed her the book on "Arson" which he had been holding when the first shot was fired. The bullet had pierced it on its career toward the lamp.
"The bullets will be evidence also," he said, "and I will measure the footprints before the rain comes down and washes them away."
"You will wish to go home, poor child," said Mrs. Shagarach to Emily. "Not yet, but soon, when you are stronger. Rachel!"