pressure had been necessary. Apparently the lock on the door was
only a trifling affair, and the steel itself was not very, tough.
The safe-makers had relied on the first line of defence to repel
attack.

Craig tried again and again, each time using less force. At last
he got a mark just about similar to the original marks on the
steel.

"Well, well, what do you think of that?" he exclaimed
reflectively. "A child could have done that part of the job."

Just then the lights went off for the night. Craig lighted the
oil-lamp, and sat in silence until the electric light plant
foreman appeared with; the card-record, which showed a curve
practically identical with that of the night before.

A few moments later Professor Fletcher's machine came up the
driveway, and he joined us with a worried and preoccupied look on
his face that he could not conceal. "She's terribly broken up by
the suddenness of it all," he murmured as he sank into an
armchair. "The shock has been too much for her. In fact, I hadn't
the heart to tell her anything about the robbery, poor girl."
Then in a moment he asked, "Any more clues yet, Kennedy?"

"Well, nothing of first importance. I have only been trying to
reconstruct the story of the robbery so that I can reason out a
motive and a few details; then when the real clues come along we
won't have so much ground to cover. The cracksman was certainly
clever. He used an electric drill to break the combination and