Miss Lowe answered at last and Kennedy took the telephone.

"What is at five hundred and one East Fifth?" he asked.

"A headquarters of the Group in the city," she answered. "Why?"

"Well, I believe that the plans of that gun are there and that the
Baron--"

"You damned spies!" came a voice from behind us.

Kennedy dropped the receiver, turning quickly, his automatic
gleaming in his hand.

There was just a glimpse of a man with glittering bright blue eyes
that had an almost fiendish, baleful glare. An instant later the
door which had so unexpectedly opened banged shut, we heard a key
turn in the lock--and the man dropped to the floor before even
Kennedy's automatic could test its ability to penetrate wood on a
chance at hitting something the other side of it.

We were prisoners!

My mind worked automatically. At this very moment, perhaps, Baron
Kreiger might be negotiating for the electro-magnetic gun. We had
found out where he was, in all probability, but we were powerless
to help him. I thought of Miss Lowe, and picked up the receiver
which Kennedy had dropped.

She did not answer. The wire had been cut. We were isolated!