"I don't care if the blasted ship blows up!" roared Captain Strong to the power-deck officer of the Solar Guard rocket cruiser Arcturus. "I want every ounce of thrust you can get out of this space heap!"

The young Solar Guard captain turned back to the loud-speaker of the audioceiver, turned the volume dial a fraction, and listened. The steady pronounced ping of Roger's signal beacon filled his ears.

When Strong discovered that Coxine had outwitted him, he had gone aboard the rocket cruiser Arcturus of Squadron Ten and had continued on search patrol. He dared not break audio silence to warn the cadets aboard the Polaris, lest he give away the position of the ship. Later, when the radar officer of the Arcturus reported a steady signal over the audioceiver, Strong at first dismissed it as some form of interference from space. But when Titan failed to report the arrival of the Polaris on time, Strong investigated the strange sound. Taking a bearing on the signal, he discovered it came from a position dangerously close to the small Jovian colony of Ganymede. After repeated attempts to raise the Polaris failed, and no distress signals had been received, Strong feared that Bull Coxine had won again. In a desperate effort to catch the criminal, he took repeated bearings on the signal and ordered full emergency space speed toward the small satellite of Jupiter.

Contacting Commander Walters at Space Academy, Strong related his suspicions and received permission to carry out a plan of action.

"I want you to engage the enemy at all costs!" ordered Walters. "Blast his space-crawling hide into protons! That's an order!"

"Yes, sir!" replied Strong with grim determination. "There's nothing I'd like better."

Six hours later Strong received confirmation of his worst fears. He was handed a message that read:

EMERGENCY:

GANYMEDE GARRISON ATTACKED ZERO THREE HUNDRED HOURS BY TWO SHIPS. ONE VESSEL IDENTIFIED AS ROCKET CRUISER POLARIS. SEND AID IMMEDIATELY. ENTIRE COLONY AT MERCY OF COXINE. SIGNED, SOMMERS, MAJOR, SOLAR GUARD.

Strong realized at once that the cadets had been forced to give the recognition code to the pirate. There wasn't any other way for the pirate to penetrate the defenses of Ganymede. And, thought Strong bitterly, to blast Coxine was to blast the cadets as well. The commander's words echoed again in his ears, "... blast him, Steve! That's an order!"