“That’ll be five-thousand-pounds for you, Selina,” said Mr. Stobell, with a would-be benevolent smile.

Miss Vickers turned a composed little face upon him and languidly closed one eye.

“I had two prizes for arithmetic when I was at school,” she remarked; “and don’t you call me Selina, unless you want to be called Bobbie.”

A sharp exclamation from Mr. Tredgold stopped all but the first three words of Mr. Stobell’s retort, but he said the rest under his breath with considerable relish.

“Don’t mind him,” said Miss Vickers.  “I’m half sorry I let him join, now.  A man that used to work for him once told me that he was only half a gentleman, but he’d never seen that half.”

Mr. Stobell, afraid to trust himself, got up and leaned out of the window.

“Well, we’re all agreed, then,” said Tredgold, looking round.

“Half a second,” said Miss Vickers.  “Before I part with this map you’ve all got to sign a paper promising me my proper share, and to give me twenty pounds down.”

Mr. Tredgold hesitated and looked serious.  Mr. Chalk, somewhat dazed by the events of the evening, blinked at him solemnly.  Mr. Stobell withdrew his head from the window and spoke.

“Twenty-pounds!” he growled.

“Twenty pounds,” repeated Miss Vickers, “or four hundred shillings, if you like it better.  If you wait a moment I’ll make it pennies.”

She leaned back in her chair and, screwing her eyes tight, began the calculation.  “Twelve noughts are nought,” she said, in a gabbling whisper; “twelve noughts are nought, twelve fours are forty—­”

“All right,” said Mr. Tredgold, who had been regarding this performance with astonished disapproval.  “You shall have the twenty pounds, but there is no necessity for us to sign any paper.”

“No, there’s no necessity,” said Miss Vickers, opening her small, sharp eyes again, “only, if you don’t do it, I’ll find somebody that will.”

Mr. Tredgold argued with her, but in vain; Mr. Chalk, taking up the argument and expanding it, fared no better; and Mr. Stobell, opening his mouth to contribute his mite, was quelled before he could get a word out.

“Them’s my terms,” said Miss Vickers; “take’em or leave’em, just as you please.  I give you five minutes by the clock to make up your minds; Mr. Stobell can have six, because thinking takes him longer.  And if you agree to do what’s right—­and I’m letting you off easy—­Mr. Tredgold is to keep the map and never to let it go out of his sight for a single instant.”

She put her head round the side of the chair to make a note of the time, and then, sitting upright with her arms folded, awaited their decision.  Before the time was up the terms were accepted, and Mr. Tredgold, drawing his chair to the table, prepared to draw up the required agreement.

[Illustration:  “Mr. Tredgold prepared to draw up the required agreement.”]