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Rh things to happen quickly. So far, adventure has succeeded adventure, but this morning has been dull as dull."

"You must stifle this longing for vulgar sensation, Tuppence. Remember that if Mr. Brown is all he is reported to be, it's a wonder that he has not ere now done us to death. That's a good sentence, quite a literary flavour about it."

"You're really more conceited than I am—with less excuse! Ahem! But it certainly is queer that Mr. Brown has not yet wreaked vengeance upon us. (You see, I can do it too.) We pass on our way unscathed."

"Perhaps he doesn't think us worth bothering about," suggested the young man simply.

Tuppence received the remark with great disfavour.

"How horrid you are, Tommy. Just as though we didn't count."

"Sorry, Tuppence. What I meant was that we work like moles in the dark, and that he has no suspicion of our nefarious schemes. Ha ha!"

"Ha ha!" echoed Tuppence approvingly, as she rose.

South Audley Mansions was an imposing looking block of flats just off Park Lane. No. 20 was on the second floor.

Tommy had by this time the glibness born of practice. He rattled off the formula to the elderly woman, looking more like a housekeeper than a servant, who opened the door to him.

"Christian name?"

"Margaret."

Tommy spelt it, but the other interrupted him.