Within a very short time Seal Island was invaded. A dozen county police, drawn from the neighbourhood, nearly the whole of the detachment from Refuge Point coastguard station, and almost all the male population of Polkerwyck flocked to the place. Every nook and cranny was investigated, the caves systematically explored, but without result. Although nearly thirty people searched the ruined oratory not one noticed the granite lid covering the pit, in spite of the fact that the Scouts, with an idea of fair play, took no steps to conceal the joints in the stone floor with dust. Tired out with their exertions, the Scouts retired to rest as soon as Coventry minor had been carried to the doctor's house. Undisturbed by the noise of the untrained searchers the lads slept soundly, till the morning revealed Seal Island untenanted save by themselves and a couple of policemen, who, at the Scoutmaster's suggestion, had installed themselves in the old oratory to keep a long and fruitless vigil. "He's slipped through our fingers, sure enough, sir," remarked one of the constables. "All night we've been on the alert. No doubt he's managed to swim across to the mainland when he found we were hard on his track. We'll be going now, sir, and leave you in peace and quietness, so to speak. If you see or hear anything, sir, happen you won't mind sending one of your young chaps to give us the tip?" As soon as the policemen were well clear of the Island, and the Scouts had had breakfast, steps were taken to continue the search for Sir Silas Gwinnear's butler, and also to explore the tunnel which they had good reason to believe communicated with the mainland. The latter task was the more enviable. Both patrols wished to undertake that particular business, and urged their respective claims till the Scoutmaster had gently and firmly to remind them of their sense of discipline. "You cannot all explore the tunnel," he added. "One patrol will be quite sufficient for that. The other will keep an eye on the camp, guard the landing-place and the approach to the Tea Caves. I suppose you have no objection to decide the matter by lots?" Walking away for a few steps, Mr Buckley gathered a handful of long grass. From this he selected two blades, one much longer than the other. These he held in his hand, with an inch of each showing at equal length. "Now, Scouts, the one who draws the longest blade represents the patrol to explore the tunnel. One of the Tenderfoots can draw: that's right, Scott." Reggie Scott pulled out one of the blades of grass from the Scoutmaster's clenched fist. It was the long one. "Good: the 'Otters' will explore the tunnel. The 'Wolves' will take up positions I have indicated on this map. It is a very clear map, Simpson, by the way. You did it excellently. Already by its means I have quite a comprehensive knowledge of Seal Island."