“Of course. How could we have been so stupid as not to see this before!”

“Why, we never suspected.”

“But we ought to have suspected. You thought you saw something move in the sedges on Sunday.”

“So I did—it was this thing: it must have been.”

“Then it swims off and comes back.”

“Then if we hunt all over the island and don’t find It—we’re no safer, because it may come off to us any time.”

“Any time.”

“What shall we do?”

“Can’t go home,” said Bevis.

“Can’t go home,” repeated Mark.