“The necessity is painful,” said Nighthawk.

“It is useless, my friend.”

“I will try it.”

Swartz smiled, and drew a paper from his pocket, which he unfolded.

“You are then determined to arrest your old comrade, Nighthawk.”

“Yes, my dear Swartz.”

“As a spy?”

“Exactly.”

“In spite of this?”

And Mr. Swartz held out the paper.