they're doing," said Haskin, finally, "but
what their game is, is beyond me. I'm not trying to hide from them or
anyone else. I don't see why they should want to track me down this
way. Go ahead, full speed, now! We'll give them a chase for it, if
they're looking for that."

It was not long before the car pulled up in a dirty, tumbledown street
near the water front, before a shop that had been turned into a moving
picture theatre. Haskin paid their way in, and they found themselves
in a darkened hall and the pictures were being thrown on to the screen
as they entered.

"One of the things these people do to attract people to their theatre,"
explained Haskin, as they took their seats, "is to have a film made
every week right here in the district where it is to be shown. For
instance, this week they are showing a picture that was made on the
river front a few days ago. People come and think that perhaps they'll
see themselves or their friends in the 'movies.' It's lots of fun for
them, you see, and it's a good idea for the company that invented it."

Jack and Dick suddenly began to understand.

"Is there anyone we know in the pictures, Captain?" asked Jack.

"That's what I hope, Jack. What I do know is that there is a section
of the film that shows three of the men who tried to wreck the train
the other night. They are talking with some other men, and it is
because I think that one of these others may be this man Broom that I
want you to see it and identify him, if you can. Then, you see, we can
send out his picture and have a much better chance of catching him."

Haskin had looked around carefully before he spoke. He had no idea
that there would be anyone around who would be able to make head or
tail out of what he was saying, but he was trained to take chances only
when he had to. But there seemed to be no one near except a sleepy,
slouchy sailor in a seat immediately behind him. The man had been
drinking, and his heavy breathing convinced Haskin that he was
harmlessly asleep.

But the next time he looked around the sailor was gone. He must have
moved very quietly to escape the notice of Haskin, and he was just
passing out through the door when the detective saw him.

"That's bad business!" he said to himself. "It was mighty careless of
me. I ought to have known better, certainly, than to talk that way,
even if there didn't seem to be anyone around to hear me. I only hope
he didn't understand,