“Then perhaps you would tell the housekeeper to stay where she is,” said Sinclair.

“Now for your men,” said Collins, when the doctor had gone out.

“We must tell them to see that no one leaves the house.” They went first to the front door and called Smith.

Collins was careful to keep the open library door in sight all the time.

After giving him his orders, they had to get in touch with the man at the back. There was a small garden, bounded by a high wall, and beyond that a lane. Seated on the wall was the figure of the other man, keeping a good look-out. Collins went to a back window and called him softly.

“Seen anything?” he asked.

“No, sir, nothing doing here,” said the man cheerfully.

It was refreshing in the midst of what looked like a grim tragedy to find a cheery soul who seemed to be enjoying himself.

He returned to Sinclair.

“Now for the room.”