"The man who was in room B!" exclaimed Gaspard. "I am sure of it!"

At that instant a downtown train rushed into the station, cutting off
Nick's view.

And a half-second later an uptown train pulled in on their side. Nick
pushed open a gate before the train had fairly stopped. He dragged
Gaspard after him.

The gateman tried to stop them, but Nick pushed the fellow in the car so
violently that he sat down on the floor.

Then the detective pulled the other gate open, and, still dragging
Gaspard, sprang down in the space between the tracks.

The other train was just starting. Nick leaped up and opened one of the
gates.

Gaspard stood trembling. Excitement and terror rendered him incapable of
action.

Nick reached down, and, seizing the man by the shoulders, lifted him up
to the platform of the car as if he had been a child of ten.

"Look back," cried the detective, pushing Gaspard to the other side of
the car. "Is your man still at the station?"

Two or three men were there, having, apparently, just missed the train.