alized that the place had a slightly rolling motion, like a ship on
the sea.

CHAPTER XIX

"I SEEN IT--A SUBMARINE!"

When Johnny realized that it was Jerry the Rat who was whispering at the
keyhole he admitted him at once.

"I seen it! I seen it; a submarine! A German submarine in the river!"
the Rat whispered excitedly. "I seen dose blokes wid me own eyes. Dey
wuz packin' a skirt thru de hatch. Den dey dropped in too. Den dey let
down the hatch, an' swush-swuey, down she went, an' all dey left was a
splash in de ol' Chicago!"

"A submarine!" Johnny exclaimed. "That doesn't sound possible; not a
German submarine surely!"

"The same," insisted Jerry. "Some old tub. Saw her over by the Municipal
Pier, er one like her. Some old fish!"

Johnny sat in silent thought. Hanada was gazing out of the window.
Suddenly the Jap exclaimed in surprise:

"Did you see that? There it goes again! Lights flashing beneath the
water. It's the 'sub' for sure. Couldn't be anything else."

"I have seen such lights before," said Johnny, striving hard to maintain
a sane judgment in this time of great crisis, "but I attributed it to
phosphorus on the water."

"Couldn't be!" declared Hanada. "Couldn't make a flicker and flash like
that. I tell you, it's a submarine, and the home of the Radicals. That's
why we couldn't find them. That's where our Russian disappeared to that
night on the bridge. That's where the shots came from. Remember right
from the center of the river? That's where your four assailants went to
when they vanished from that deserted building. It's the Radicals.
C'mon! We may not be too late yet. We'll get them before the police get
us."

Together the three rushed from the room.

"Did you say they were carrying a woman?" Johnny asked Jerry, as they
hastened down the stairs.

"Yes, a skirt; a swell-looking skirt. Mouth gagged, hands tied, but
dressed to kill, opry coat and everything!"

"Some more of their dirty work," Johnny grumbled, "but we'll get them
this time. If we can convince the police that they're there they'll drag
the river and haul 'em out like a dead rat."

* * * * *

At the moment when the three men were hurrying down the stairs which led
from Johnny's room to the street, Mazie sat silently searching the faces
of the men about her. Wild questions raced through her brain. Who were
these men? Why had they kidnapped her? What did they want? What would
they do