This is Nan Smith' Mistery , another excellent fic!

I love this story:

Quote
Dear Lois,
Since you are reading this, then I know that we have met.
I was just going to write you and let you know that I would
be leaving and wouldn't be coming back for a long time.
But somehow it seemed too impersonal. You always told me
that if you ran into me in the street, we would never
become friends. I decided to put that to the test.

If we have become friends again tonight, then you will now
be in possession of my coat and this letter. I knew you
would never agree to meet me, even though you may never
hear from me again. So I decided to take on a `secret
identity' so you wouldn't be self-conscious. Now you know
that we could be friends no matter what. It also proves to
you that you don't have to stand behind those barriers
you've erected for yourself.

Don't be afraid to spread your wings and soar. You can do
anything you set your mind to, I can feel it from the words
you have written to me these past few years.

This will be my last letter to you for quite some time. I
have volunteered for some duty which will isolate me from
normal society for a long while. Take care of yourself,
and don't be afraid to show other people the girl I know
I'll see tonight.

As Always,
Your Friend,

Clark Jerome Kent
Simona smile