the gun tests had been declared off for the day, they having been most satisfactory.
The German officer's servant, it appeared, had managed to gain entrance to the ammunition chamber by means of a false key to the outer door. There were two entrances, the other being from the top of the platform where the cannon rested. Koku had seen him about to throw something into one of the ammunition cases, and had grappled with him. There was a fight, and, in spite of the giant's strength, the man had slipped away, leaving part of his garments in the grasp of Koku.
An investigation of some of the powder showed that it had been covered with a chemical that would have made it explode prematurely when placed in the gun. It would probably have wrecked the cannon by blowing out the breech block, and might have done serious damage to life as well as property.
"But what was the object?" asked Ned.
"To destroy Tom's gun," declared Mr. Damon.
"Why should von Brunderger want to do that?"
They found the answer among his papers. He had been a German officer of high rank, but had been dismissed from the secret service of his
