That night I was seized with an unconquerable sleepiness, about an hour after I had dismissed Susan Dodd.  The room was very quiet, not a sound except the ticking of the pretty little clock upon the mantelpiece.  Milly was fast asleep, and I was sitting on a low chair by the fire trying to read, when my drowsiness overcame me, my heavy eyelids fell, and I went off into a feverish kind of slumber, in which I was troubled with an uneasy consciousness that I ought to be awake.

I had slept in this way for a little more than an hour, when I suddenly started up broad awake. [In] the intense quiet of the room I had heard a sound like the chinking of glass, and I fancied that Milly had stirred.

There was a table near her bed, with a glass of cooling drink and a bottle of water upon it.  I thought she must have stretched out her hand for this glass, and that in so doing she had pushed the glass against the bottle; but to my surprise I found her lying quite still, and fast asleep.  The sound must have come from some other direction—­from the dressing-room, perhaps.

I went into the dressing-room.  There was no one there.  No trace of the smallest disturbance among the things.  The medicine-bottles and the medicine-glass stood on the little table exactly as I had left them.  I was very careful and precise in my arrangement of these things, and it would have been difficult for the slightest interference with them to have escaped me.  What could that sound have been—­some accidental shiver of the glass, stirred by a breath of wind, one of those mysterious movements of inanimate objects which are so apt to occur in the dead hours of the night, and which seem always more or less ghostly to a nervous watcher?  Could it have been only accidental? or had Mrs. Darrell been prowling stealthily in and out of that room again?

Why should she have been there?  What could her secret coming and going mean?  What purpose could she have in hovering about the sick girl? what could her hatred profit itself by such uneasy watchfulness, unless—­ Unless what?  An icy coldness came over me, and I shook like a leaf, as a dreadful thought took shape in my mind.  What if that desperate woman’s hatred took the most awful form? what if her secret presence in that room meant murder?

I took up the medicine-bottle and examined it minutely.  In colour, in odour, in taste, the medicine seemed to me exactly what it had been from the time it had been altered, in accordance with the Manchester doctor’s second prescription.  Mr. Hale’s label was on the bottle, and the quantity of the contents was exactly what it had been after I gave Milly her last dose—­one dose gone out of the full bottle.

‘O, no, no, no,’ I thought to myself; ’I must be mad to imagine anything so awful.  A woman may be weak, and wicked, and jealous, when she has loved as intensely as this woman seems to have loved Angus Egerton; but that is no reason she should become a murderess.’