suggestion of four racing shadows on the blue-green disk of the gibbous Terra that hung low in the heavens, and then nothing. The airless silence of Luna Base continued unbroken.

In the sheathed Control Tower, the Operations Officer made ready to go off watch. He was thinking of a few drinks and a girl and maybe a thick steak down in Ley City. Wonderful place, Ley City ... even in wartime.

The door burst open, but it was not his relief. It was a breathless yeoman of signals. He held a sheaf of papers in his hand.

"Has Blue Three lifted, sir? Cryptographing sent me with this."

"Damn! They're well out by this time Reilly." He indicated the radar screen that showed four rapidly moving pips already heading into deep space.

The yeoman handed him the papers without a word.

"What kept you?" The officer demanded angrily.

Reilly looked at his superior reproachfully. "I made it from Crypto in forty seconds flat, sir. Couldn't come any faster!"

"Dammit! Now we'll have to put this on tight beam and scramble it. Intelligence suspects the Cats have cracked our cipher!"

He sat down at the scrambler and began to type.

"COMMODORE CLARE HARTNETT: ABOARD TRS DARKSIDE FLOTILLA BLUE THREE. PRIORITY MISSION. REPEAT. PRIORITY MISSION. SPATIAL INTELLIGENCE REPORTS LARGE QUANTITY ISOTOPE X-R REFERENCE 6589-3 CODE BOOK IN DANGER OF CAPTURE AT METALLURGICAL STATION 9 CHART REFERENCE A-5. PREVENT AT ALL COSTS. LARGE CONCENTRATION MARTIAN PHOBOS CLASS CRUISERS AND POSSIBLE SUPERDREADNAUGHT ARMED WITH CYCLOTRONICS IN VICINITY SEARCHING FOR STATION 9. REPEAT. X-R MUST NOT FALL INTO MARTIAN HANDS. DESTROY IF NECESSARY. FOR YOUR INFORMATION AND GUIDANCE INTELLIGENCE SUSPECTS CIPHER TWO HAS BEEN CRACKED BY MARTIAN CRYPTO. LUCK. DO NOT ACKNOWLEDGE. SIGNED: TORAN LONG, CAPTAIN, SENIOR CONTROL, LUNA BASE. END MESSAGE."

Rising, he detached the roll of perforated tape from the scrambler and fed it into the tight beam transmitter. When the roll was consumed, Long dropped sullenly into a chair. His relief arrived, but all desire to partake of the joys of Ley City was gone. Like most of the old timers he admired Hartnett immensely, and he could not rid himself of the feeling that he was in some way 

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