She had just been insured, and had been very much interested in the various tests that the woman doctor of the insurance company had applied to her.  One in particular which involved the use of a little simple instrument that fitted over the forearm had interested her particularly.  She had talked to the doctor about it, and as she talked an idea had occurred to her that it might have other uses than those which the doctor made of it.  She had bought one.  While she was waiting it occurred to her that perhaps it might serve her purpose.  She got the instrument out.  It consisted of a little arrangement that fitted over the forearm, and was attached by a tube to a dial that registered in millimeters a column of mercury.  Would it really show anything, she wondered?

There was a quick call on the telephone and she answered it, her hand trembling, for she felt sure that it was something about the little woman she had befriended.

Somehow or other her voice hardened as she answered the call and found that it was from Drummond.  It would never do to betray even nervousness before him.

“Your friend, Miss Carr,” shot out Drummond with brutal directness, “has been caught again.  She fell into something as neatly as if she had really meant to do it.  Yesterday, you know, Trimble’s advertised the new diamond, the Arkansas Queen, on exhibition.  Well, it was made of paste, anyway.  But it was a perfect imitation.  But that didn’t make any difference.  We caught Kitty just now trying to lift it.  I’m sorry it wasn’t the other one.  But small fry are better than none.  We’ll get her, too, yet.  Besides, I find this Kitty has a record already at Stacy’s.”

He added the last words with a taunting sneer.  Constance realized suddenly the truth.  The whole affair had been a plant of Drummond’s!

“You are at Trimble’s?” she inquired quickly.  “Well, can you wait there just a few minutes?  I’d like to see Miss Carr.”

Drummond promised.  His acquiescence in itself boded no good, but nevertheless she decided to go.  As she left her apartment hurriedly she picked up the little instrument and dropped it into her hand-bag.

“You see, it’s no use,” almost chortled Drummond as Constance stepped off the elevator and opened the door to a little room at Trimble’s much like that which she had already seen at Stacy’s.  “A shoplifter becomes habitual after twenty-five.  They get to consorting with others of their kind.”

Kitty was sitting rigidly motionless in a chair, staring straight ahead, as Constance entered.  She gave a start at the sight of a familiar face, rose, and would almost have fainted if Constance had not caught her.  It seemed as if something had snapped in the girl’s make-up.  For the first time tears came.  Constance patted her hand softly.  The girl was an enigma.  Was she a clever actress—­one minute hardened Miss Sophisticated, the next appealing Miss Innocence?