"Now what we want to do," Venables began, "is this. We want to be in a position to make a close study of yonder house without arousing the suspicions of the people there. I racked my brain for a long time before I could think of a feasible scheme. And then it came to to me like an inspiration. What could we do better than pass ourselves off as an Ordnance Survey party down here on business? That is why I procured the official-looking caps, to say nothing of the theodolite and the notebooks. Now you, Lord Ravenspur, have only got to look wise and give us directions. You look exactly like the head of an exploring party. We will pretend to work the theodolite, and make measurements, and all that kind of thing."
"Inside the grounds?" Walter asked.
"Of course," Venables went on; "that is the beauty of the scheme. No spot of ground is sacred to an Ordnance party. I have actually seen them work inside a church. All we have got to do is to go about our business boldly and be quite firm if anybody attempts to molest us. It may be news to you that nobody can be prosecuted for trespass unless specific damage is done."
The instruments were recovered presently from the hiding-place, and with the theodolite on his shoulder Venables stepped boldly on to the lawn in front of the house, and gravely went to work. The blinds were all up by this time. The windows were opened, and a glimpse of well-furnished rooms could be seen in the background. A couple of maids stood in one of the windows, and watched the strangers curiously.
"It looks respectable enough," Venables muttered, pretending to be exceedingly busy. "You may depend upon it, this is a tougher job than we anticipated. These servants are all right. You may be sure that they know nothing of what is going on. However, to make certain, I'll ask them for myself."
Venables approached the window and asked civilly for the loan of a small piece of string. He came back presently, after a chat of a minute or two, and once more appeared to be wholly engrossed in his instrument. At the same time, he was telling his companions the information which he had gleaned.
"I knew I was right," he said. "The house has been let furnished to an Italian gentleman called something or another, I didn't quite catch what, and the people only came down yesterday. Those servants go with the freehold, so to speak, and they have all been in their present situation for some considerable time. Their master is a City stockbroker, who, with his family, is on the Continent for the next month or two. If we are lucky we shall probably get a sight of the Italian presently, though I expect we have all got a pretty shrewd notion who the gentleman is."
The work proceeded gravely for a quarter of an hour. Levels appeared to be taken, and there was much entering of figures in the notebooks. Presently, as Walter glanced around him, he drew a deep breath, for there was no mistaking the identity of the slim figure that emerged from one of the open French windows and came striding eagerly down the lawn.
"Silva," Walter said under his breath. "Don't pretend to see him till he gets quite close. I think it would be a good thing if we left all the interviewing to Venables."
The Italian approached the group and superciliously demanded to know what they were doing there. He looked quite the master of the place in his cool, flannel suit. He had a cigarette between his strong, white teeth.