tiously and deliberately with a view to a minimum of noise. Finally they agreed that there was sufficient space to admit the passage of a human body, and Frank began to lower himself through the opening.
The attic was very low, only about five feet from floor to roof, and when Frank's feet touched the boards beneath he tested their strength. Having satisfied himself that the floor was strong enough to support his weight, he crouched down, flashing the light about him in search of some mode of egress to the lower part of the building.
He cautioned Joe to wait on the roof. The condition of the building was such that the floor might not be strong enough to hold them both, in which event disaster would overtake them.
At first he thought the attic was entirely separated from the rest of the mill. The floor seemed to be solid. There was not the sign of a stairway or opening of any kind.
Frank was bitterly disappointed. To have been successful so far and then find themselves in a narrow little room under the eaves of the mill!
Suddenly he caught sight of a crack between the boards, and he held the flashlight closer to investigate. He found a space about two feet square, evidently a trapdoor cut in the floor, and he tugged at the edges of this until at
