Dr. Lepardo from beneath a table rumbled hoarsely:
"There is a back stair. He went out that way as someone came in."
Julius Rohscheimer started violently.
"Good God! Then he was here when I came in!" he exclaimed.
"Who speaks?" rumbled Lepardo, crawling away into the outside office, and apparently following a trail visible only to himself.
"It is Mr. Julius Rohscheimer," explained Simons. "He was a partner, I understand, of the late Mr. Graham's. He entered with a key about seven o'clock and discovered the murder."
"As he came in our friend the assassin go out," cried Lepardo.
Harborne gave rapid orders to the two constables, both of whom immediately departed.
"Are you sure of that, sir?" he called.
Against the promptings of his common sense, the eccentric methods of the peculiar old traveller were beginning to impress him.