Indians told us, and then to have a biplane come sailing over our heads at night, it's pretty sure to be the one we want. But, Tom, can't you close upon 'em?"
"I'm going to try. The machinery is warmed up now, and I'll send it to the limit."
Once more he adjusted the wheels and levers, and at his touch the Falcon seemed to gain new strength. She fairly soared through the air.
Eagerly those in the pilot house watched the craft they were pursuing. She could be seen, in the glare of the big searchlight, like some bird of gloom and evil omen, fluttering along ahead of them.
"They certainly have a fine motor!" cried Tom. "I was sure I could have caught up to them before this."
"How do you account for it?" asked Mr. Damon.
"Well, they're flying a good deal lighter than we are. They probably have no load to speak of, while we carry a heavy one, to say nothing of Koku."
"Diamonds aren't very heavy," put in Mr. Whit ford grimly. "I think they are smuggling diamonds to-night. How I wish we could catch them, or trace them to where they have their headquarters."
