"I'm giving it to you straight," she said simply. "After you have made out a good fat check, then you go to a store, buy something, tell them to forward the check to the bank for certification, and that you'll send for the goods and the change the next day. The bank always certifies the check, and you get the money."

"Not always," said Peabody with a grin.

"No, not always," acquiesced Mrs. Parker. "But Jim and I have been averaging over a hundred dollars a day for months."

"Good graft, all right," assented the detective. "But how does the one who lays down the check identify himself? For instance, suppose I go into Tiffany's and pick out a diamond, and say I'm Mr. John Smith, of 100 West One Hundredth Street, and the floorwalker says, 'Sorry, Mr. Smith, but we don't know you,' what then?"

"Just flash a few letters on him," said the girl. "Letters and envelopes."

"Where do you get 'em?" asked Peabody.

"Just write them, silly, and send them to yourself through the mail."

"That's all right," retorted the "second story man." "But how can I mail myself a letter to 100 West One Hundredth Street when I don't live there?"

Mrs. Parker smiled in a superior manner.

"I'm glad I can put you wise to a new game, I invented it myself. You want letters of identification? In different names and addresses on different days? Very good. Buy a bundle of stamped envelopes and write your own name and address on them in pencil. When they arrive rub off the pencil address. Then if you want to be John Smith of 100 West One Hundredth Street, or anybody else, just address the cancelled envelope in ink."