"How?" I asked.

But Quinn yawned, looked at his watch, and said: "That's entirely too long a story to spin right now. It's past my bedtime, and Mrs. Quinn's likely to be fussy if I'm not home by twelve at least. She says that now I have an office job she can at least count on my being round to guard the house—something that she never could do before. So let's leave Mary for another time. Goodnight"—and he was off.


IV

THE CLUE ON SHELF 45

"Of course, it is possible that patriotism might have prompted Mary McNilless to locate the clue which prevented an explosion that would have seriously hampered the munitions industry of the United States—but the fact remains that she did it principally because she was in love with Dick Walters, and Dick happened to be in the Secret Service. It was one case where Cupid scored over Mars."

Bill Quinn eased the game leg which he won as the trophy of a counterfeiting raid some years before into a more comfortable position, reached for his pipe and tobacco pouch, and settled himself for another reminiscence of the Service with which he had formerly been actively connected.

"Mary was—and doubtless still is—one of those red-headed, blue-eyed Irish beauties whom nature has peppered with just enough freckles to make them alluring, evidences that the sun itself couldn't help kissing her. But, from all I've been able to gather, the sun was in a class by itself. Until Dick Walters came upon the scene, Miss McNilless held herself strictly aloof from masculine company and much preferred to spend an evening with her books than to take a trip to Coney or any of the other resorts where a girl's kisses pass as current coin in payment for three or four hours' outing.

"Dick was just the kind of chap that would have appealed to Mary, or to 'most any other girl, for that matter. Maybe you remember him. He used to be at the White House during Taft's regime, but they shifted most of the force soon after Wilson came in and Dick was sent out to the Coast on an opium hunt that kept him busy for more than a year. In fact, he came east just in time to be assigned to the von Ewald case—and, incidentally, to fall foul of Mary and Cupid, a pair that you couldn't tie, much less beat."