"You can rely upon me to do so, ma'am," said Tufnell earnestly.
"Very well. We will now go upstairs."
She left the drawing-room and proceeded towards the broad oak staircase, with Musard close behind her. Detective Caldew followed more slowly, noting his surroundings. When they reached the head of the staircase Miss Heredith switched on the electric current, and the bedroom corridor sprang into light. Detective Caldew was surprised at its length.
"Where does this passage lead to?" he asked abruptly.
"To the south side of the moat-house," replied Musard.
"Has it any outlet?"
"Yes; a door at the end communicates with a narrow staircase, leading to another door at the bottom. The second door was a former back entrance—it opens somewhere near the servants' quarters, I think?" He glanced inquiringly at Miss Heredith.
"Those stairs are never used now," she replied. "The entrance door at the bottom of the staircase is kept locked."
"There are such things as skeleton keys," commented the detective.
Musard opened the door of the death-chamber and switched on the light. Caldew walked at once to the bedside. He drew away the covering which had been placed over the face of the young wife, and stood looking at her.