The Thankless Task of Retrieval

I'm looking for the lost letter
under the rank leaves
in the last light

in the valley that is memory
in the valley that is forgetting

where the house is disassembled
at the brink of its recollection
where the house is disremembered
at the point of its resurrection

and in the back yard
by the last light
the molecules of the lost letter
cascade through the deepening mulch
forever.