Nancy, “but tell me, did she really fall off the roof and did you catch her?”

“Shall I tell her?” Danny turned to Sally.

“Sure. Tell her. She wouldn’t believe me.”

“Well, then,” said Danny, in a mock-solemn voice, “it’s really true. I made a real catch that time. But then, the elm helped out a lot.”

“Good old elm!” Sally exclaimed. “I’ll never forget it! And now,” she added, “I feel in need of reviving.”

The reviving came with good steaming cups of coffee.

Danny Duke could stand the glare of a neon light, Sally found as she looked at his strong, friendly face.

“I’m just past twenty,” he told them with a touch of boyish pride. “And my training is about finished right now.”

“How is it you’re here so far from the Navy flying schools?” Nancy asked.

“I was back on some math, so they sent me here to brush up. I’ve about got it now. Another two weeks will do it.”

“Too bad,” Sally sighed. “But that will be time enough to teach me to receive code, won’t it?”

“Oh, sure,” Danny grinned. “But say, are you the practical young miss! Here I save your life, and first thing you insist that I do something more for you.”

“It’s not for me.” Leaning across the table Sally allowed her voice to drop. “It’s much more important than that, I hope. It’s for our old friend Uncle Sam. The things I did up there on the roof are part of it, just as my learning code will be. You are such a nice boy, I want you to have a part in it.”

“Well, thanks—” Danny was visibly embarrassed. “Thanks a lot: I’ll help all I can.”

The truth is that Danny was to have a much greater part in the undertaking than either he or Sally knew.

“And now for one more try at the two black boxes,” Sally whispered excitedly after the girls had said good-bye at the gangplank of their ship that really wasn’t a ship at all.

“It works! And it’s going to help a lot, that aerial is,” Sally exclaimed a few minutes later.

This was true. They were able now to catch the 

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