"He declares that he never received a penny for supplying the
information upon that paper, and we have no evidence of any outside
payments to him. He did not attempt to conceal his handwriting, and
when I made inquiries of his firm, he owned up at once that the paper
was his work. He said that for years past he had given particulars of
ships under construction to the same parties as on this occasion. He
admitted that to do so was contrary to regulations, especially in
wartime, but thought that under the circumstances he was doing no
harm. I am not exactly a credulous person, and I have heard some tall
stories in my time, but for once I am inclined to believe that the man
is speaking the truth. I believe that he received no money, and was
acting throughout in good faith."

"I am more and more puzzled. What in the world can the circumstances
be which could induce an experienced middle-aged man, employed in
highly confidential work in a great shipyard, not only to break faith
and lose his job, but to stick his neck into a rope and his feet on
the drop of a gallows. Reveal the mystery."

"You are sure that you have never seen that paper before?" asked
Dawson again, this time slowly and deliberately.

"Of course not!" I said. "How could I?"

"That is just what I have to find out," said Dawson. He stopped, took
out a knife, prodded his nearly smoked cigar, puffed once or twice
hard to restore the draught, and spoke. "That is what interests me
just now. For, you see, this very indiscreet and reprehensible
swinehound of a draughtsman, who is at present in my lockup, declares
that he was without suspicion of serious wrong-doing, because