"Yes," mused Strong. "I thought that would be the answer. But how did that ship get through your defenses?"
"Captain Strong," said Williams grimly, "I don't think there is any question about it. Someone broke the asteroid code. The attacking ship identified itself as the regular supply ship."
"A Solar Guardsman?" asked Strong.
"No, sir," said Williams. "I'd bet anything that none of our men would do that!"
"Then who?" asked Strong.
"Only one man would be smart enough to get the code and break it, and then sneak it off to the attacking ship!"
"Who?" asked Strong.
"Bull Coxine!" answered the young officer through clenched teeth.
They were interrupted by a guardsman. "Sir, we found this in prison hut twenty-four."
"What is it?" asked Strong.