I started to my feet, and sat down again. She had been doing detective work indeed! I thought I could understand it all. This was the house we had for days suspected and watched, but the only one ever seen to enter it had been Greenback Bob. Doubtless the murder of the brunette made them so uneasy that, contrary to custom, Delbras had ventured out by day, probably to learn what he could of the movements of the officers. I turned to Mrs. Camp.

'Mrs. Camp,' I began earnestly, 'I am going to confide in you. Those men belong to a gang of robbers and murderers; we have been watching them for weeks. Fortunately, you have come upon them in such a way as to locate their hiding-place; you can help us very much if you will try to recall everything just as you saw it there, and will answer a few questions, when you have told your story. Or—is this all?'

'All! I guess it ain't all; an' I guess you won't need to ask many questions when I get through!' I nodded, and she went on rapidly:

'When I see that feller dodge back and shet the winder, I remembered what you had said about him and the others, and 'bout their tellin' me, to that office, how you was a detective yourself; and I jest sez to myself, says I, "I'm goin' to try an' git another look at that house;" so I went on past it till I come to a little store, and I went in an' bought ten cents' worth of green tea, and when I comes out I goes back, jest as if I was going home with my shoppin'. By the way, you ain't seemed to notice these new clo's.'

I had noted the black gown and cape-like mantle she wore, both plain, but neat and not an ill fit; and I had also wondered how she had happened to discard her old straw hat with the lopping green bows for the simple dark bonnet she wore, but she did not wait for my criticism.

'I'll tell you how't come,' she went on. 'I ain't blind, and I'd been a-noticin' the difference 'twixt my clo's and some of the rest of 'em; and I was specially took with them plain gownds them ladies wore that you interduced me to that day; an' I jest studied on it, and sort o' calkalated the expense, and then went up to the stores. I wanted a gray rig, like that Miss Ross had on, but I couldn't get none to fit, an' the young lady told me 't black was dredful fash'nable now, so I got this rig; an' 'twas lucky I did ter-day.'

What could she mean by this diversion? I was growing uneasy when she uttered the last words. 'Yes?' I said feebly.

'I s'pose you wonder what I'm drivin' at?' she queried. 'Well, it's comin'. Ye see, I was wearin' these clo's, and the goggles, as I call 'em, when I went sa'nterin' past that house; but I hadn't got to it, nor even to the s'loon yet, when a cab—one of them two-wheeled things, you know, with the man settin' up behind to drive.'

I nodded.

'Wal, it drove up, an' the man opened the door, right in front of that house, an' out got a woman; she was bigger than me, and all drest in black, an' she looked sort of familiar, an' jest as I was wonderin' who she made me think of, an' she was a-paying the driver, up comes another cab, tearin', and out hopped two fat, red-faced perlecemen, an' there was a little squabble like, an' the woman flung herself round so't I could see her face, an' then I knew her.'