mortar between the bricks seemed for the most part undisturbed.
Breitmann made the first discovery of any importance. Just above his
height, standing in the chimney itself, he saw a single brick
projecting beyond its mates. He reached up, and shook it. It was
loose. He wrenched it out, and came back into the light.

"See! Nothing less than a chisel could have cut the mortar that way.
Miss Killigrew is right." He went back, and with the aid of the tongs
poked into the cavity. The wall of bricks was four deep, yet the tongs
went through. This business had been done from the other side.

"Well!" exclaimed the admiral, for once at loss for a proper phrase.

"You see, father? I was right. Now, what can it mean? Who is digging
out the bricks, and for what purpose? And how, with the alarms all
over the house, to account for the footprints in the flour?"

"It is quite likely that something is hidden in the chimney, and some
one knows that it is worth hunting for. This chimney is the original,
I should judge." Fitzgerald addressed this observation to the admiral.

"Never been touched during my time or my father's. But we can soon
find out. I'll have a man up here. If there is anything in the
chimney that ought not to be there, he'll dig it out, and save our
midnight visitor any further trouble."

"Why not wait a little while?" Fitzgerald ventured. "With Breitmann
and me in the house, we might trap the man."

"A good scheme!"