"Knowledge," he said shortly.
Hamilton looked at his subordinate in alarm.
"Dash it, you aren't off your head, too, are you?"
Bones shook his head with vigour.
"Knowledge of the occult, sir and brother-officer," he said. "One is never too old to learn, sir, in this jolly old world."
"Quite right," said Hamilton; "in fact, I'm pretty certain that you'll never live long enough to learn everything."
"Thank you, sir," said Bones.
The girl, who had had less qualms than Bones when the summons arrived, and had, in consequence, returned more leisurely, came into the room.
"Pat," said her brother, "Sanders is down with fever."
"Fever!" she said a little breathlessly. "It isn't—dangerous?"