"I made a mistake, eh? Oh, possibly. Look in the other carriage, my child."

With an unaffected air of confidence she turned to do so, and I turned to watch her, for I began to understand the "scheme" at which I was assisting, and foresaw that the emotion she had failed to betray at the door of the first carriage might not necessarily be lacking on the opening of the second.

I was all the more assured of this from the fact that Miss Althorpe's stately figure was very plainly to be seen at that moment, not in the coach Miss Oliver was approaching, but in an elegant victoria just turning the corner.

My expectations were realized; for no sooner had the poor girl swung open the door of the second hack, than her whole body succumbed to a shock so great that I expected to see her fall in a heap on the pavement. But she steadied herself up with a determined effort, and with a sudden movement full of subdued fury, jumped into the carriage and violently shut the door just as the first carriage drove off to give place to Miss Althorpe's turn-out.

"Humph!" sprang from Mr. Gryce's lips in a tone so full of varied emotions that it was with difficulty I refrained from rushing down the stoop to see for myself who was the occupant of the coach into which my late patient had so passionately precipitated herself. But the sight of Miss Althorpe being helped to the ground by her attendant lover, recalled me so suddenly to my own anomalous position on her stoop, that I let my first impulse pass and concerned myself instead with the formation of those apologies I thought necessary to the occasion. But those apologies were never uttered. Mr. Gryce, with the infinite tact he displays in all serious emergencies, came to my rescue, and so distracted Miss Althorpe's attention that she failed to observe that she had interrupted a situation of no small moment.

Meanwhile the coach containing Miss Oliver had, at a signal from the wary detective, drawn off in the wake of the first one, and I had the doubtful satisfaction of seeing them both roll down the street without my having penetrated the secret of either.

A glance from Mr. Stone, who had followed Miss Althorpe up the stoop, interrupted Mr. Gryce's flow of eloquence, and a few minutes later I found myself making those adieux which I had hoped to avoid by departing in Miss Althorpe's absence. Another instant and I was hastening down the street in the direction taken by the two carriages, one of which had paused at the corner a few rods off.

But, spry as I am for one of my settled habits and sedate character, I found myself passed by Mr. Gryce; and when I would have accelerated my steps, he darted forward quite like a boy and, without a word of explanation or any acknowledgment of the mutual understanding which certainly existed between us, leaped into the carriage I was endeavoring to reach, and was driven away. But not before I caught a glimpse of Miss Oliver's gray dress inside.

Determined not to be baffled by this man, I turned about and followed the other carriage. It was approaching a crowded part of the avenue, and in a few minutes I had the gratification of seeing it come to a standstill only a few feet from the curb-stone. The opportunity thus afforded me of satisfying my curiosity was not to be slighted. Without pausing to consider consequences or to question the propriety of my conduct, I stepped boldly up in front of its half-lowered window and looked in. There was but one person inside, and that person was Franklin Van Burnam.

What was I to conclude from this? That the occupant of the other carriage was Howard, and that Mr. Gryce now knew with which of the two brothers Miss Oliver's memories were associated.