"I am at your service," I returned. "But, first, I should like to explain——"

"Pardon me," interposed the District Attorney. "Explanations will come later. Mr. Gryce says he has no time to lose, the woman being a very restless one and liable at any moment to flit. Her name is Mille-fleurs; or, rather, that is the name by which she is known on the police books. You have seen her, and have only to follow Mr. Gryce; he will explain the rest."

I bowed my acquiescence, and joined the old detective at the door.

"It will be a rough night," that venerable official remarked, with a keen glance at my outfit. And with just this hint as to what was before us, he stepped out into the street, where I hastily followed him.

We did not carry umbrellas, Mr. Gryce looking upon them as a useless encumbrance; and as I waited there in the wet while my companion exchanged some words with a man who had stepped up to him, I marvelled at the impassibility of this old man and the astonishing vigour he showed in face of what most young and able-bodied men would consider the disadvantages of the occasion. Short as was the whispered conference, it seemed to infuse fresh life into the rheumatic limbs I had frequently seen limping along in much more favourable weather, and it was with a gesture of decided satisfaction he now led the way to a cab I had already seen dimly outlined through the mist which now enveloped everything in sight.

"We shall have to cross the city," he announced, as he followed me inside. "It's a bad night and gives promise of being worse. But you are young, and I—well, I have been younger, but, young or old, have always managed so far to be in at the finish."

"It is the finish, then?" I ventured, with that sinking of the heart Leighton might have felt had he heard his own doom thus foreshadowed.

The old detective smoothed out the lap-robe he had drawn over his knees.

"There is reason to think so, unless some mistake or unforeseen misfortune robs us of success at the moment of expected triumph. Is your interest a friendly or a professional one? The affair is one which warrants either."

It was a question I was surely entitled to evade. But I had already decided to be frank in my explanations to the District Attorney, and why not with the man most in his confidence?