"Better leave the car back on the road some distance and go the rest of the way on foot," suggested Frank. "We can sneak up on 'em better that way."

They clambered into the automobile. The other men were broad-shouldered, keen-eyed fellows with determined faces. The moonlight glinted on rifle barrels and revolvers.

Through the cool night sped the automobile, out the shore road, leaving Bayport behind, until at last the car turned off into the deserted road, rocking and bumping to and fro in the ruts.

When they reached the place where Frank and Joe had abandoned the motorcycles earlier in the evening the boys spoke to the driver, whereupon he brought the car to a stop.

They got out and stood in a little group in the moonlit road. Fenton Hardy was in charge of the raid, and he gave his orders quickly and with precision. The men were to follow the road until they reached the meadow between the wood and the mill. The troopers were to deploy out so as to come up in the rear of the mill; the Secret Service men and the others were to take the front way.

They trudged down the road until at last they stood at the edge of the wood and they could see the mill below them in the moonlight. Then the three troopers moved off to the right, keeping well in the shade, preparatory to cutting down across the meadow toward the back of the mill.

Fenton Hardy, the two Secret Service men and the boys walked boldly across the meadow.

They were not seen. There was not a sound from the mill.

When they reached the front of the building they could see the dark forms of the three troopers who flitted across the grass and waited in readiness back of the mill in case any one should attempt to escape that way.

Mr. Hardy tried the front door. It swung open. He stepped inside. The Secret Service men followed. The boys crowded close at their heels.