“When you dare not trust the soundness of your reins you do not try to pull up a bolting horse. For three years I have endeavoured to guide Stephanie round awkward comers with as little visible restraint as possible. When we differ over any project upon which she has set her heart Stephanie has one strong argument.”

“That you no longer love her?”

“Well, perhaps; but more forcibly expressed. She rushes to the top of the building—there are six floors, Mr Carrados, and we are on the second—and climbing on to the banister she announces her intention of throwing herself down into the basement. In the meanwhile I have followed her and drag her back again. One day I shall stay where I am and let her do as she intends.”

“I hope not,” said Carrados gravely.

“Oh, don’t be concerned. She will then climb back herself. But it will mark an epoch. It was by that threat that she obtained my acquiescence to this scheme—that and the certainty that she would otherwise go on without me. But I had no intention of allowing her to land herself—to say nothing of us both—behind the bars of a prison if I could help it. And, above all, I wished to cure her of her fatuous delusion that she is clever, in the hope that she may then give up being foolish.

“To fail her on the occasion was merely to postpone the attempt. I conceived the idea of seeming to cooperate and at the same time involving us in what appeared to be a clever counter-fraud. The thought of the real loss will perhaps have a good effect; the publicity will certainly prevent her from daring a second ‘theft.’ A sordid story, Mr Carrados,” he concluded. “Do not forget your cigarette-case in reality.”

The paternal shake of Carrados’s head over the recital was neutralized by his benevolent smile.

“Yes, yes,” he said. “I think we can classify you, Mr Straithwaite. One point—the glove?”

“That was an afterthought. I had arranged the whole story and the first note was to be brought to me by an attendant. Then, on my way, in my overcoat pocket I discovered a pair of Stephanie’s gloves which she had asked me to carry the day before. The suggestion flashed—how much more convincing if I could arrange for her to seem to drop the writing in that way. As she said, the next box was empty; I merely took possession of it for a few minutes and quietly drew across one of her gloves. And that reminds me—of course there was nothing in it, but your interest in them made me rather nervous.”

Carrados laughed outright. Then he stood up and held out his hand.