to discuss my business or his," she said, "and I don't
care what you threaten me with or what you do."

"I will do something more than threaten you," he said ominously, "you
will not fool me, Miss Glaum, and the sooner you realize the fact the
better. I am going all the way with you if you give me any trouble, and
if you don't answer my questions. I might tell you that unless this
interview is a very satisfactory one to me I shall not only arrest
Doctor van Heerden to-night but I shall take you as an accomplice."

"You can't, you can't." She almost screamed the words.

All the sullen restraint fell away from her and she was electric in the
violence of her protest.

"Arrest him! That wonderful man! Arrest me? You dare not! You dare not!"

"I shall dare do lots of things unless you tell me what I want to know."

"What do you want to know?" she demanded defiantly.

"I want to know the most likely address at which your friend the doctor
can be found--the fact is, Miss Glaum, the game is up--we know all about
the Green Rust."

She stepped back, her hand raised to her mouth.

"The--the Green Rust!" she gasped. "What do you mean?"

"I mean that I have every reason to believe that Doctor van Heerden is
engaged in a conspiracy against this State. He has disappeared, but is
still in London. I want to take him quietly--without fuss."

Her eyes were fixed on his. He saw doubt, rage, a hint of fear and
finally a steady light of resolution shining. When she spoke her voice
was calm.

"Very good. I will take you to the place," she said.

She went out of the room and came back five minutes later with her hat
and coat on.

"It's a long way," she began.

"I have a taxi at the door."

"We cannot go all the way by taxi. Tell the man to drive to Baker
Street," she said.

She spoke no word during the journey, nor was Beale inclined for
conversation. At Baker Street Station they stopped and the cab was
dismissed. Together they walked in silence, turning from the main road,
passing the Central Station and plunging into a labyrinth of streets
which was foreign territory to the American.

It seemed that he had passed in one step from one of the best-class
quarters of the town to one of the worst. One minute he was passing
through a sedate square, lined with the houses of the well-to-do,
another minute he was in a slum.

"The place is at the end of this street," she said.

They came to what seemed to be a stable-yard. The