Mr. Browning threw back his head and laughed so I thought he would bust. “Listen to that, Topper. We should have taken in these kids on the start. They know how to cruise after treasure. Ho....”

“A fine mess they’ve made of things,” says Mr. Topper.

“Might be worse. Anyhow, we’re sure now. No mistake. And we know where they are.”

“But we’ve got to go to Nantucket.”

“Sure. They’d have followed us anyhow. Now they’re interested in this chart, and they’ll be digging all over the place. It’ll keep them occupied. They think they’ve got something, and it will give us a chance to do our bit of business and be off for home.”

“Maybe, but I don’t like it. Say, where did you kids make your cross for them to dig?”

“Here’s a chart,” says Catty. “I’ll show you.”

He did, and pointed with his finger to the place we had marked for the Porpoise men to do their digging. I heard Mr. Topper make a funny noise, and I looked from him to Mr. Browning, and he looked as if somebody had hit him in the stomach.

“However did you come to pick that locality?” says he.

“Why,” says Catty, “it looked like a likely place for treasure to be buried.”