"This is a very unexpected turn of affairs," said I; "and what then?"

"Well, I found my plans very seriously menaced. It looked as if the pair might take an immediate departure, and so necessitate very prompt and energetic measures on my part. At the church door, however, they separated, he driving back to the Temple, and she to her own house. 'I shall drive out in the park at five as usual,' she said as she left him. I heard no more. They drove away in different directions, and I went off to make my own arrangements."

"Which are?"

"Some cold beef and a glass of beer," he answered, ringing the bell. "I have been too busy to think of food, and I am likely to be busier still this evening. By the way, Doctor, I shall want your co-operation."

"I shall be delighted."

"You don't mind breaking the law?"

"Not in the least."

"Nor running a chance of arrest?"

"Not in a good cause."

"Oh, the cause is excellent!"

"Then I am your man."

"I was sure that I might rely on you."

"But what is it you wish?"

"When Mrs. Turner has brought in the tray I will make it clear to you. Now," he said as he turned hungrily on the simple fare that our landlady had provided, "I must discuss it while I eat, for I have not much time. It is nearly five now. In two hours we must be on the scene of action. Miss Irene, or Madame, rather, returns from her drive at seven. We must be at Briony Lodge to meet her."

"And what then?"

"You must leave that to me. I have already arranged what is to occur. There is only one point on which I must insist. You must not interfere, come what may. You understand?"

"I am to be neutral?"

"To do nothing whatever. There will probably be some small unpleasantness. Do not join in it. It will end in my being conveyed into the house. Four or five minutes afterwards the sitting-room window will open. You are to station yourself close to that open window."

"Yes."

"You are to watch me, for I will be visible to you."

"Yes."

"And when I raise my hand–so–you will throw into the room what I give you to throw, and will, at the same time, raise the cry of fire. You quite follow me?"

"Entirely."