They talked in low tones till a customer came in, apparently interested in the sale of vegetables, and Mr. Sandborn made a few purchases and left. The Chief had already contacted the network of agents all over the country, and concentration would soon begin on Porpoise Island if Mr. Sandborn’s investigations confirmed the boys’ reports.

Having no use for the vegetables he had bought, he left them on one of the back steps in the poorer section of the town, in as inconspicuous a manner as possible, being quite sure no one had seen him do so, and then went about his other business. He asked a hundred innocent questions that forenoon, making notes of everything, mentally, and trying to piece together parts of the facts. He visited the library, the yacht club, and the Sailor’s Snug Harbor, and gathered more facts.

The Sea Hawk was registered in the name of a “Mr. James Fitch, lawyer,” and her port of registry as New York. Some of the facts he learned made him smile, others caused him to whistle in a low tone. And then he saw a gray speedboat pulling into the town wharf at noon.

In it was a trio of men, all three stern faced, all three of medium build and in business suits. The leader appeared to be harder than the other two and smoked cigarettes constantly. They left their boat moored at the wharf and went briskly uptown. Mr. Sandborn hurried to John’s store, slid into the back room, and there opened a small closet door. He removed his jacket and armpit holster and hung them on a peg, taking a stubby revolver from a small shelf and putting that into his pocket instead. Then he put on his jacket again and came out through the store.

He went down to the wharf, and, watching his opportunity, slid open a hatch over a motor in the gray boat, pulled a wire loose, and went back onto the wharf to lounge about. He had not long to wait, for the trio soon appeared, strode briskly down the wharf, and got into the boat.

But the motor would not start and the leader seemed impatient. Again the helmsman tried to start the motor. It sputtered a little but would not run. At once, of course, people began to come along the wharf, attracted by the missing motor. The men seemed anxious to be off. One of them cursed, and another lifted the hoods over the engines and began an examination. His ignorance of marine engines was very apparent, and he utterly overlooked the detached wire. Mr. Sandborn leaned over from the crowd and asked,

“Won’t run?”

For answer the men glared up at the speaker.

“Mind if I try to start her?” queried Mr. Sandborn.

At that the leader frowned.