What they heard was unintelligible.

"Sector Four ... squawk ... spsst!" snarled the loudspeaker. "Colonel ... squawk ... troops in ... squawk ... move tank squad to ... spsst-crack-crack!... more ambulances ... squawk ... ninety per cent disabled...."

Periodically the pilot tried to establish contact:

"G-boat MC-20 to Marsport. G-boat MC-20 to Marsport. Come in, Marsport."

The attempts were futile until the G-boat had entered the atmosphere and was gliding high above the desert on its broad wings. Then, miraculously, the airwaves were clear for a moment.

"Marsport to G-boat MC-20," said the loudspeaker. "Go ahead."

"G-boat MC-20 to Marsport," said the pilot hurriedly. "Give us a beam. We're coming in for a landing."

"Don't land! We're...!" exclaimed the loudspeaker, and exploded into static in midsentence.

"What the hell do they mean, don't land?" snorted the pilot, fiddling frantically and uselessly with dials. "They think I've got enough fuel to get back to Phobos?"

The G-boat held its glide and swooped down on Marsport, a tiny landing field and a miniature group of buildings set apart from the dome of Mars City. Groups of men were scurrying about at the port like ants. A column of smoke rose ominously from one of the buildings.

The G-boat touched ground and skidded to a stop in mid-field. Its passengers unstrapped and the pilot opened the port.

Men crowded into the G-boat, men with drawn heat-guns, men in the blue-and-gold marsuits of the Charax Rebels!

Jonner, a free man again, rode into Mars City in a groundcar with Sir Stanrich O'Kellin. Stein and Aron had remained at Marsport for the time being. Marsport was completely in the hands of the Rebels, and efforts were being made to get through by radio to Phobos to give the Marscorp forces there a surrender ultimatum.

"What's happened to the Mars City dome?" asked Jonner in astonishment as they approached the city. The once-transparent dome was cracked and badly discolored.

"Plan Blue," answered Sir Stanrich with a smile.

"Look, sir, how about telling me what happened?" said Jonner. "When we got 

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