The same that had fallen into and through ‘Alisdair’s' pocket.  
The key. The key. Where has it fallen? I’ll scour the place.
I have fallen through this world for it. Now I lay at the bottom.
For amidst my lack of bright wit, with which I did fall.  
I often thought I’d found it. Something to free me, all
but free from everything to a solvable small problem.  
But the bottom is bottomless, as it often was above.
I’ll scour this fallen city, till I’m sour, to find young pity.

She fell into my lap. With the key around her neck.
Not out of nowhere, nor from above or below.
But fell none the less. And so of course I had to check.
I pinched myself twice, but she still lay staring deeply
into my eyes as until her eyes turned sleepily.
And then creepily I wandered through her head while she slept.