"But how did he pull the holdup on Ganymede, then?" asked Roger.
"Coxine escaped from the prison asteroid in a jet boat, disguised as a guard," continued Shinny. "Only man ever to escape. He drifted around in the belt for a while and was picked up by a freighter going to Ganymede. The freighter had been out rocket-hopping among the asteroids, collecting the prospectors' small supplies of uranium and taking the stuff back to Ganymede for refining. Wallace happened to be dead-heading on the freighter. When they got to Ganymede, and Coxine saw all the money lying around at the Credit Exchange to pay off the prospectors, he convinced Wallace to go in with him and they robbed the Exchange. Coxine was caught red-handed, but Wallace got away. In fact, the Solar Guard didn't know Wallace had anything to do with it. So Coxine was taken back to the prison asteroid, and Wallace has been driftin' around the system ever since."
"But, Mr. Shinny," asked Astro, "if you knew Wallace was tied up with the robbery of the Credit Exchange, why didn't you tell the Solar Guard before now?"
"Sonny," sighed Shinny, "most of what I know is space dust and space gas. But even so, I don't think Commander Walters or Captain Strong, or even you boys, would think much of me if I went around like an old space crawler, blowin' my jets all over the place."
Strong had listened to Shinny fill in the background of Bull Coxine with a thoughtful look in his eyes. He remembered all too clearly the mutiny on the ship out to Titan. Coxine had been an enlisted Solar Guard petty officer aboard the ship. He had made great strides in two years and was being considered as an officer candidate on the very day he tried to take over the ship. When Strong regained control later, he talked to Coxine, trying to find out why he had started the mutiny. But the man had only cursed him, swearing vengeance. Strong hadn't seen him since.
"So you think he would know where Wallace and Simms might be hiding out?" Strong asked finally.
"If anyone does," replied Shinny, "he does. And I'll tell you this, Captain, if you go to talk to him and I figger you will, you'll find him a lot tougher."
"Will I?"
"Well, take yourself, for instance. No reflection on you, of course, but take yourself. You're smart, you're hard, and you got a good mind. You're one of the best spacemen in the deep. Take all that and turn it bad. Real bad. Sour it with too many years on a prison asteroid and you've got a fire-eating rocket buster as tough and as rough as God and society can make him!"
The three cadets gulped and looked at Strong. They saw their skipper clench his teeth and ball his fists into tight knots.