"What's the matter, Tom?" asked Mr. Sharp, as the lad came hurrying along the roof, having taken the precaution to fasten the scuttle door as well as he could. "You seem excited." "So would you, if you had heard what I did."  
"What? You don't mean that some of the gang is down there?"
 
"Yes, and what's more I'm on the trail of the thieves who robbed the Shopton Bank of the seventy-five thousand dollars!"
 
"No! You don't mean it!"
 
"I certainly do."
 
"Then we'd better tell Mr. Damon. He's in the cabin."
 
"Of course I'll tell him. He's as much concerned as I am. He wants to be vindicated. Isn't it great luck, though?"
 
"But you haven't landed the men yet. Do you mean to say that the same gang—the Happy Harry crowd—robbed the bank?"
 
"I think so, from what I heard. But come inside and I'll tell you all about it."
 
"Suppose we start the ship first? It's ready to run. There wasn't as much the matter with it as I feared. The storm is over now, and we'll be safer up in the air than on this roof. Did you get all the information you could?"
 
"All I dared to. The men were coming out, so I had to run. They were quarreling, and when that happens among thieves—"
 
"Why honest men get their dues, everyone knows that proverb," interrupted Mr. Damon, again emerging from the cabin. "But bless my quotation marks, I should think you'd have something better to do than stand there talking proverbs."
 
"We have," replied Mr. Sharp quickly. "We're going to start the ship, and then we have some news for you. Tom, you take the steering wheel, and I'll start the gas machine. We'll rise to some distance before starting the propellers, and then we won't create any excitement."
 
"But what news are you going to tell me?" asked Mr. Damon. "Bless my very existence, but you get me all excited, and then you won't gratify my curiosity."
 
"In a little while we will," responded Mr. Sharp. "Lively now, Tom. Some one may see this airship on top of the building, as it's getting so much lighter now, after the storm."
 
The outburst of the elements was almost over and Tom taking another look over the edge of the roof, could see persons moving about in the street below. The storm clouds were passing and a faint haze showed where a moon would soon make its appearance, thus disclosing the craft so oddly perched upon the roof. There was need of haste.
 
Fortunately the Red Cloud could be sent aloft without the use of the propellers, for the gas would serve to lift her. It had been found that light............