DPF / Strand

For mystery, from a favorite by Mark Strand. This full version was found at npr:
the mysterious-arrival-of-an-unusual-letter
and at The Storialist blog:

from The Mysterious Arrival of an Unusual Letter / by Mark Strand

It had been a long day at the office and a long ride back to the small apartment where I lived. When I got there I flicked on the light and saw on the table an envelope with my name on it. Where was the clock? Where was the calendar?