Mr. Pettigrew came down himself in the evening.
"Well, Miss Covington, I think that the scent is getting warm. Now is the time that you must be very cautious. I think we may take it that the child is somewhere within ten or twelve miles of Stanford, north or east of it. The man was away for over three hours, and he rode fast. It's not likely that the horse was anything out of the way. However, allowing for half an hour's stay somewhere, I think we may take twelve miles as the limit. Still, a circle of twelve miles' radius covers a very large area. I have been looking up the map since that man set about inquiring down there. Twelve miles would include the whole of the marshes as far as Leigh. It goes up to Brentwood, Billericay, Downham, and touches Rayleigh; and in that semicircle would be some sixty or seventy villages, large and small."
"I have been looking at the map too, Mr. Pettigrew, and it does not seem to me at all likely that he would go near the places that you first mentioned; they are quite close to the Great Eastern Railway, by which he would have traveled, instead of going round such an enormous detour by Tilbury and Stanford."
"One would think so, my dear, certainly; but, you see, a man having the least idea that he was watched, which I admit we have no reason for believing that this fellow has, would naturally choose a very circuitous route. However, I think that we need hardly try so far to the north, to begin with; I should say that the area of our search need go no farther north than Downham, and that between a line running west from that place and the river the child is most likely to be hidden."
"I should say, Mr. Pettigrew, that the detective might engage four or five fellows who could act separately in villages on each of the roads running from Stanford east or northeast. The villages should be at least two miles away from Stanford, because he might start by one road and then turn off by another. But in two miles he would probably settle down on the road he was going to follow and we should, therefore, get the general direction of Walter's hiding place. Then, as soon as he passed, the watcher should follow him on foot till he met him coming back. If he did meet him, he would know that at any rate he had been farther; if he did not meet him, he would know that he had turned off somewhere between him and the village that he had passed. Netta and I have been talking the matter over, and it seems to us that this would be the best plan, and that it would be as well, also, to have a man to watch at Tilbury Station; because he may possibly choose some entirely different route the next time he comes, and the men in the villages, not knowing that he had come down at all, might be kept there for a month waiting for his next visit."
"You and your friend have certainly put your heads together to good purpose," the old lawyer said, "and I do not see any better plan than you suggest. You had better have Bassett down here, and give him your instructions yourself."
"Yes, Mr. Pettigrew; and I shall be glad if you will write a line to him to-night, for in three days it will be a month since this man last went down, or at any rate since we know that he went down. Of course, it may be three months before he goes again, and if he does not come in four or five days the men must be recalled; for although each of them could stop in a village for a day or two under the pretense of finding work in the neighborhood, they certainly could not stop for a month."
"Very well, I leave you a free hand in the matter, altogether, Miss Covington; for frankly I acknowledge that you are vastly more likely to ferret the thing out than I am."