did the woman do?"

"Reported him to the first policeman she met, but by that time he had
vanished, of course."

"What did Chief Fleck think about it?"

"He didn't seem to take the story seriously."

"Do you suppose it could have been Mr. Hoff?"

"It must have been he, or one of his gang, at any rate. I don't see why
the Chief does not order his arrest at once. He is far too dangerous to
be at large."

"There's no real evidence against him yet," protested Jane, "not against
the young man, at least."

"Didn't we both see him in British uniform?"

"Yes," admitted the girl.

"Well, that's proof, isn't it? A man with a German name in British
uniform in wartime can't be up to any good."

"Still we have no actual evidence against him. We don't know what he was
doing."

"I'd arrest him then for murder and get the evidence that he is a spy
afterward. It would be easy to fasten the murder of K-19 on him. There's
no doubt that he did that."

"Has a witness been found?" asked Jane with a quick catch of the breath.
Somehow she never had been able to persuade herself that the man next
door, whatever else he might be, had really committed that
brutal murder.

"No, there's no actual witness, but it could be proved by circumstantial
evidence. K-19, the man whose work you took up, had instructions to
shadow young Hoff to his home. At two in the morning he relieved another
operative. At three you yourself saw him shadowing Hoff."

"I saw two men on the sidewalk," corrected Jane. "One of them was
Frederic Hoff. I did not see the other distinctly enough to identify
him. I saw no murder. I merely saw the two of them run around
the corner."

"Look here," said Dean sharply, not wholly succeeding in suppressing a
note of jealousy in his tones, "I believe you are trying to shield
Frederic Hoff. What is he to you? Has he won you over to his side?"

"You've no right to say such things to me," cried Jane, nevertheless
coloring furiously. "I've seen the man only three or four times. I am
working just as hard as you are to prove that he is a German spy, if he
is one. I am only trying to be fair. I know nothing that convicts him of
murder. Any testimony I could give would not prove a single thing."

"Certainly not, if that's the way you feel about it," snapped Dean.

After that they rode along together in silence, each busy with thoughts
of their own. Dean was cursing himself for having let his enthusiasm to
be of service to h