“That is so, signore, though I much regret it.”

“You need not regret. You are only doing your duty,” I said. “But I merely wish to assure you that I have no intention of trying to escape you. In fact, I couldn’t walk the length of this room at present to save my life. I’m too weak. But before you place a constable on duty here, I would ask you one favour.”

“What is that?”

“To convey a letter for me to the secretary at the Italian Embassy in Grosvenor Square. He will give you instructions regarding me.”

“Then you are known at the Embassy!” the police agent exclaimed, in surprise.

“I think you will find that I am.”

The nurse brought a pen, ink and a sheet of paper, upon which after great difficulty I wrote a note recalling my confidential visit regarding Nardini’s death, and explaining that the police were in error in thinking that I had any hand in the death of the guardian of the Villa Verde. I had been at the villa, I admitted, but out of curiosity, as I had watched the action of Miller and his companions. If any one were sent to me from the Embassy, I said, I would make a confidential statement.

When I had sealed the letter, the police agent took it, and next morning I received a call from the official with whom I had had a chat on the occasion of my visit to the Embassy. To him I explained the whole circumstances in strictest confidence, and described the secret hiding-place in the dead man’s library where were concealed a number of official papers that were evidently of great importance.

He heard me to the end, and afterwards reassured me by saying:—

“We have already given the police commissario instructions not to take any further steps against you, Mr Leaf. We quite accept your explanation, and at the same time thank you for this further information you are able to give us. A search shall be made at the spot you indicate.”