"Hadn't you better tell us plainly what you've been about?" said Warrender.

"In words of one syllable. I bought a box of tin-tacks. Here it is, and here's the one we found in the bush. You see, they're twins. They were bought at the same shop, to wit, the one owned by Samuel Blevins, general dealer and banjoist, I understand. My uncle's gardener bought three yesterday. Now, I ask you, would any man's gardener sprinkle inoffensive campers with tin-tacks unless instructed to? It's all as plain as a pikestaff. My mad uncle has a morbid horror of trespassers. He leaves word that they are to be chevied away by means fair or foul----"

"But No Man's Island isn't his," Warrender interrupted.

"Certainly. That proves his madness. He thinks anybody who gets a footing here has designs on his property. It's a sort of Heligoland. He employs an ex-poacher to guard his own domains, and the foreigners to clear his outpost. Nothing could be plainer."

"Rot!" exclaimed Armstrong.

"Have it your own way. The facts are undeniable. Rush and the foreigners are in league to get rid of us, and they can't have any motive except their master's interest."

"We don't know that," said Warrender. "Your imagination runs too fast, young man. We don't even know for certain that Rush and the foreigners are working together. All we really know is that some one wants to make the place too uncomfortable for us. The question is, what shall we do?"

"Stick it," said Armstrong. "It means keeping watch by night; we can take turns at that. We'll soon find out if----"

"Ahoy, there!" cried a voice from the river.

Unperceived, a skiff had run in under the bank, and its occupant, a stout old gentleman in flannels, was stepping ashore.