“This may prove to be a big thing,” he said, pushing a row of buttons on his desk. “We’ve been after these fellows all along the waterfront for a long time, but up until now they have managed to slip through our hands with ease. This may be the finishing touch. I’ll put my men on the trail at once.”

Several detectives reported to the chief, who informed them of the details of a raid which he planned. He decided to go down personally and the boys begged to be allowed to go. He assented and they rode down in Mr. Ferris’ car.

“We’ll go around to the alley at the back,” the chief decided. “I have men who are to raid the place in the front and I think it best that we look in at the rear. There may be some means of exit there that will bear watching.”

They ran down the alley that passed back of the ship chandler’s place and sat in the car, waiting. After what seemed like a long time a whistle suddenly shrilled out from the other street. Instantly the captain was out of the car, the boys and Mr. Ferris following.

“I guess we can get in this way,” the chief said, leading the way between two narrow houses. They arrived at the back of the shop in time to see two detectives come out with two men, one of whom was Frank and the other the man called Marcy.

“Got these two sleeping in the back, chief,” one of the detectives said. “The boss of the place is out front, safely collared. I guess this is a dumping ground, all right. The cellar is full of stuff.”

“Do you boys know either of these men?” asked the chief.

“Indeed we do,” answered Don. “This man Frank helped to imprison me, and later on he tried to capture the sloop when Terry was on board. The other man is the one who followed me through the cellar at Mystery Island.”

“I wonder what became of Benito the leader?” mused Jim.

One of the detectives shook the two captives. “Where is your leader?” asked the detective.